https://padlet.com/8406424/ih5s2qz9jh37 Chemistry I en-us 2017-09-12 14:09:43 UTC 2026-01-21 12:05:28 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Condos.png 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/188425592 The atomic mass of an atom is the mass of an atom of a chemical element expressed in atomic mass units.]]> 2017-09-18 12:36:26 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/188425592 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/190807363 a positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission; the nucleus of a helium atom.]]> 2017-09-25 13:29:17 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/190807363 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/190807847 The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).]]> 2017-09-25 13:30:05 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/190807847 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/190809568 The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).]]> 2017-09-25 13:33:26 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/190809568 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192053688 A negatively charged ion, i.e., one that would be attracted to the anode in electrolysis.]]> 2017-09-28 13:19:26 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192053688 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192055317 the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.]]> 2017-09-28 13:22:23 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192055317 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192063999 The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding cloud of electrons.]]> 2017-09-28 13:37:57 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192063999 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192065895 the number 6.022 × 10²³ indicating the number of atoms or molecules in a mole of any substance.]]> 2017-09-28 13:41:09 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192065895 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192067989 A fast-moving electron emitted by radioactive decay of substances. (The emission of beta particles was originally regarded as a ray.).]]> 2017-09-28 13:44:49 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192067989 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192070052 a positively charged ion, i.e., one that would be attracted to the cathode in electrolysis.]]> 2017-09-28 13:48:05 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192070052 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192413355 A Group 11 element is one in the series of elements in group 11 (IUPAC style) in the periodic table, consisting of transition metals which are the traditional coinage metals of copper (Cu), silver (Ag), and gold (Au).]]> 2017-09-29 12:27:14 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192413355 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192418057 The control variable (or scientific constant) in scientific experimentation is the experimental element which is constant and unchanged throughout the course of the investigation.]]> 2017-09-29 12:40:51 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192418057 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/192420098 a variable (often denoted by y ) whose value depends on that of another.

]]> 2017-09-29 12:46:32 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/192420098 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/194267184 a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.]]> 2017-10-05 12:38:53 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/194267184 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/194268358 Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The Pauling scale is the most commonly used. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7.]]> 2017-10-05 12:41:08 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/194268358 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/194270829 Fission is the splitting of heavy nuclei (such as uranium) – in two smaller nuclei. This process needs less energy to 'bind' them together – so energy is released. Fission happens quite easily – and is used to generate electricity in conventional nuclear power stations.]]> 2017-10-05 12:45:33 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/194270829 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/195525862  Combining lighter atomic nuclei to form a heavier nucleus. Energy is released. The opposite of fission]]> 2017-10-10 11:16:06 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/195525862 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/195527379 penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei.]]> 2017-10-10 11:22:42 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/195527379 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/195528087 In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table, and the f-block columns (between groups 3 and 4) are not numbered.]]> 2017-10-10 11:25:40 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/195528087 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/195531272 The time in which half the atoms in a radioactive isotope decay.]]> 2017-10-10 11:38:38 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/195531272 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/195532117 any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen, from which simple salts can be made.]]> 2017-10-10 11:42:11 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/195532117 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/195532908 a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.]]> 2017-10-10 11:45:04 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/195532908 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/195537004 An independent variable is defines as the variable that is changed or controlled in a scientific experiment. Independent variables are the variables that the experimenter changes to test their dependent variable. A change in the independent variable directly causes a change in the dependent variable.]]> 2017-10-10 11:59:23 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/195537004 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196371178 An ion is an atom or group of atoms in which the number of electron s is different from the number of proton s. If the number of electrons is less than the number of protons, the particle is a positive ion, also called a cation.]]> 2017-10-12 12:14:40 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196371178 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196372285 The ionic radius is the measure of an atom's ion in a crystal lattice. It is half the distance between two ions that are barely touching each other. Since the boundary of the electron shell of an atom is somewhat fuzzy, the ions are often treated as though they were solid spheres fixed in a lattice.]]> 2017-10-12 12:17:10 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196372285 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196904130 The ionization energy (IE) is qualitatively defined as the amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated gaseous atom to form a cation.]]> 2017-10-13 17:08:08 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196904130 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196905151 The series of fifteen metallic elements from lanthanum to lutetium in the periodic table.]]> 2017-10-13 17:10:04 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196905151 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196906497 The main group is the group of elements whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon as arranged in the periodic table.]]> 2017-10-13 17:12:58 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196906497 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196910395 The total number of protons and neutrons in a nucleus.]]> 2017-10-13 17:22:16 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196910395 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196913662 Any chemical element that is an effective conductor of electricity and heat can be defined as a metal. A metal is also good at forming bonds and cations with non-metals. Atoms inside of a metal quickly lose electrons in order to make positive ions or cations.]]> 2017-10-13 17:30:29 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196913662 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196920825 an element whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors.]]> 2017-10-13 17:48:24 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196920825 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196922245 Standard Molar Volume is the volume occupied by one mole of any gas at STP. Remember that "STP" is Standard Temperature and Pressure. Standard temperature is 0 ° C or 273 K. Standard pressure is 1 atmosphere or 760 mm Hg (also called "torr"). 1 mole of any gas at STP occupies 22.4 liters of volume.]]> 2017-10-13 17:51:43 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196922245 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196923570 The molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance. The base SI unit for molar mass is kg/mol. However, for historical reasons,molar masses are almost always expressed in g/mol.]]> 2017-10-13 17:54:53 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196923570 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196924298 It is defined as the amount of a chemical substance that contains as many elementary entities, e.g., atoms, molecules, ions, electrons, or photons, as there are atoms in 12 grams of carbon-12 (12C), the isotope of carbon with relative atomic mass 12 by definition.]]> 2017-10-13 17:56:49 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196924298 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196926339 The neutron is a subatomic particle, symbol n or n0 , with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons constitute the nuclei of atoms.]]> 2017-10-13 18:01:29 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196926339 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/196927288 Any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. ]]> 2017-10-13 18:03:36 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/196927288 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/197310725 a chemical element that lacks the characteristics of a metal and that is able to form anions, acidic oxides, acids, and stable compounds with hydrogen.]]> 2017-10-16 12:49:43 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/197310725 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/199931364 Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, such as an alpha particle, beta particle, or gamma ray.]]> 2017-10-24 12:02:10 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/199931364 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/199935401 The nucleus is the center core of an atom that has a positive charge and that contains most of the atom's mass.]]> 2017-10-24 12:14:00 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/199935401 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/199936490 A period is the name given to a horizontal row of the periodic table. ]]> 2017-10-24 12:17:08 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/199936490 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/200042141 A table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns.]]> 2017-10-24 15:23:59 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/200042141 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/200045218 A subatomic particle found in the nucleus of every atom. The particle has a positive electrical charge, equal and opposite to that of the electron. ]]> 2017-10-24 15:28:24 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/200045218 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/200046966 A part of chemistry that deals with figuring out the elements or ingredients of which a compound or mixture is made. ]]> 2017-10-24 15:31:09 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/200046966 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/200051343 The determination of the absolute or relative abundance of one, several or all particular substance(s) present in a sample.]]> 2017-10-24 15:38:34 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/200051343 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/200054235 The shielding effect describes the attraction between an electron and the nucleus in any atom with more than one electron shell.]]> 2017-10-24 15:43:27 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/200054235 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/200056346 A well-established explanation for scientific data.]]> 2017-10-24 15:47:06 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/200056346 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/200057555 Any of the set of metallic elements occupying a central block in the periodic table.]]> 2017-10-24 15:49:07 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/200057555 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/204787206 A chemical bond is the force that holds two atoms together.]]> 2017-11-08 13:26:44 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/204787206 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/204798411 A chemical bond formed between two ions with opposite charges.]]> 2017-11-08 13:50:13 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/204798411 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208154160 An ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding.]]> 2017-11-17 15:35:59 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208154160 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208156263 The symmetrical three-dimensional arrangement of atoms inside a crystal.]]> 2017-11-17 15:39:52 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208156263 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208159424  chemical compound that conducts electricity by changing into ions when melted or dissolved into a solution.]]> 2017-11-17 15:45:28 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208159424 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208167131 A measure of the energy contained in the crystal lattice of a compound, equal to the energy that would be released if the component ions were brought together from infinity.]]> 2017-11-17 15:58:49 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208167131 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208169540 It is the lowest whole number ratio of ions represented in an ionic compound.]]> 2017-11-17 16:03:06 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208169540 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208170769 An ion consisting of a single atom. ]]> 2017-11-17 16:05:38 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208170769 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208171932 A charged chemical species (ion) composed of two or more atoms]]> 2017-11-17 16:07:55 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208171932 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208173557 An anion containing one or more oxygen atoms bonded to another element (as in the sulfate and carbonate ions).]]> 2017-11-17 16:11:06 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208173557 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208175837 In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.]]> 2017-11-17 16:15:29 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208175837 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208177651 Electrons in a molecule, ion or solid metal that are not associated with a single atom or a covalent bond.]]> 2017-11-17 16:18:50 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208177651 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208702767 The chemical bonding that holds the atoms of a metal together.]]> 2017-11-20 13:50:26 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208702767 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/208703830 A substance made by melting two or more elements together, at least one of them a metal.]]> 2017-11-20 13:52:51 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/208703830 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/215025635 Composed of two chemical elements]]> 2017-12-11 14:31:48 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/215025635 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/215027607 A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.]]> 2017-12-11 14:35:09 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/215027607 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/215028907 A compound, typically a crystalline one, in which water molecules are chemically bound to another compound or an element.]]> 2017-12-11 14:37:26 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/215028907 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/215029987 A formula giving the number of atoms of each of the elements present in one molecule of a specific compound.]]> 2017-12-11 14:39:30 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/215029987 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/215424591 A compound consisting of three elements; may be ionic or covalent.]]> 2017-12-12 14:32:41 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/215424591 8406424 https://padlet.com/8406424/ih5s2qz9jh37/wish/216166517 The percentage by mass of each element in a compound.]]> 2017-12-14 14:38:36 UTC https://padlet.com/8406424/ih5s2qz9jh37/wish/216166517