https://padlet.com/aross0805/mqk8gpa29rt5 en-us 2019-01-08 15:36:32 UTC 2025-12-30 12:16:43 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Lightdecrease.png aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318361583 The atomic mass is the weighted average mass of the isotopes of an element]]> 2019-01-08 15:40:00 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318361583 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318362303 The top number is the element’s
atomic number. It tells you the number of protons in the nucleus of each atom of that element.]]> 2019-01-08 15:40:55 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318362303 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318362887 A compound is a
substance whose smallest unit is made up of atoms of more than
one element bonded together.]]> 2019-01-08 15:41:44 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318362887 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318364332 Negatively charged particles are called electrons.]]> 2019-01-08 15:42:48 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318364332 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318365218 Electrons travel in a region surrounding the nucleus,
which is called the electron cloud.]]> 2019-01-08 15:43:57 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318365218 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318366295 An element is matter made of atoms of only one kind. ]]> 2019-01-08 15:45:38 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318366295 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318366870 These two
types of chlorine atoms are chlorine-35 and chlorine-37. They
are called isotopes (I suh tohps), which are atoms of the same
element that have different numbers of neutrons]]> 2019-01-08 15:46:29 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318366870 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318367986 An atom’s mass number is the number
of protons plus the number of neutrons it contains. The numbers
35 and 37, which were used to refer to chlorine, are mass numbers.
Hydrogen has three isotopes with mass numbers of 1, 2, and 3.]]> 2019-01-08 15:48:10 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318367986 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318369981 Metals generally have a shiny or metallic luster and are good
conductors of heat and electricity. All metals, except mercury, are
solids at room temperature. Metals are malleable (MAL yuh bul),
which means they can be bent and pounded into various shapes.]]> 2019-01-08 15:51:04 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318369981 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318370812 Metalloids are elements that have characteristics of metals and nonmetals. On the periodic table, metalloids are found between the metals and nonmetals]]> 2019-01-08 15:52:06 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318370812 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318371538 When two or more substances (elements or compounds) come together but don’t combine to make a new substance, a mixture results.]]> 2019-01-08 15:53:06 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318371538 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318372137 It was proposed that another particle must be in the nucleus
to account for the extra mass. The particle, which was later
called the neutron (NEW trahn), would have the same mass as
a proton and be electrically neutral.]]> 2019-01-08 15:53:57 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318372137 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318372859 Nonmetals are elements that are usually dull in appearance. Most are poor conductors of heat and electricity. Many are gases at room temperature, and bromine is a liquid.]]> 2019-01-08 15:55:02 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318372859 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318374052 A proton is a positively
charged particle present in the nucleus of all atoms. The rest of
each atom is empty space occupied by the atom’s almost mass less
electrons.]]> 2019-01-08 15:56:39 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318374052 aross0805 https://padlet.com/aross0805/mqk8gpa29rt5/wish/318374963 Matter that has
the same composition and properties throughout is called a
substance.]]> 2019-01-08 15:57:42 UTC https://padlet.com/aross0805/mqk8gpa29rt5/wish/318374963