https://padlet.com/19jmeza2/trehxdg29t6s Made with a taste for adventure en-us 2016-11-03 04:18:00 UTC 2016-11-03 05:04:53 UTC hello@padlet.com 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134980716

First scientist to use “data”

If you start with the same substance you can end with something different

All elements are composed of atoms

Law Of Conservation Of Mass - mass of the product = the mass of the reactants

Law Of Multiple Proportions - same substance stays the same as what they are divisible by, same ratio

*Atom = indivisible, can’t be divided, can’t be created or destroyed in chemical reactions*

Compounds are composed of different elements

*Atoms of the same element are identical*

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Used a cathode ray tube and a magnet to discover a negative charge in atoms

The tube is a closed, gas, vacuumed tube

He discovered smaller particles in an atom that are negatively charged

They are called electrons, a subatomic particle

He was the first scientist to make a model of the atom, called the “Plum Pudding model” 

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Used the gold foil experiment to discover positively charged particles

He shot alpha particles (+) at a piece of gold foil

The results were that most of the alpha particles went through the foil without being deflected, others were scattered, and few were shot straight back

He discovered positive particles in the atom, also known as the nucleus

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John Dalton was born September 6, 1766, in Eaglesfield, England]]> 2016-11-03 04:52:17 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134983075 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134983291

December 18, 1856, Cheetham Hill, Manchester, United Kingdom]]> 2016-11-03 04:53:39 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134983291 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134983683

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August 30, 1871, Brightwater, New Zealand]]> 2016-11-03 05:06:20 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134983998 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984049

]]> 2016-11-03 05:07:57 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984049 19hsmith https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984145 1. The diameter of an atom is 10,000x larger than the diameter of the atomic nucleus
2. The subscript tells you the atomic number, the number of protons and electrons if the atom is neutral
3. The superscript tells the mass number and the number of protons and neutrons
4. The electrical charge is "0" if the atom is neutral
5. You can identify an isotope by the element name - mass #
ex. Sodium - 24
6. All isotopes have the same atomic number because they all have the same # of protons
7. All isotopes don't have the same mass # because the neutrons differ
8. Isotope - an atom of an element with the same # of protons and different mass # and neutrons]]> 2016-11-03 05:10:14 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984145 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984159 2016-11-03 05:10:24 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984159 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984223 2016-11-03 05:11:43 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984223 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984250 2016-11-03 05:12:15 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984250 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984293

Atoms make up everything around us

The relative mass of proton and neutron = 1 

The relative mass of an electron is 0 

The majority of mass in an atom is in the nucleus 

The atomic mass unit (amu) = the subatomic particles

1amu = the mass of the proton + neutron (relative)

The mass of atom = mass of protons and neutrons

Atomic mass, average of all the different isotopes not including electrons

Mass number, protons + neutrons

Atomic # = 3 of protons

Mass number is not on the periodic table, protons = the neutrons

Isotopes = the same # of protons, different number of neutrons

Subscript - small # below or to the right of an atom, many of the atom are connected in a molecule

Coefficient - large # in front of an atom or molecule (# of copies)

Letters - each atom alone or combined, 1 capital letter, tells you the name of the atom

The arrangement of the atoms is determined by the physical and chemical properties

If they have subscripts they are also bonded

ex. Each molecule of a compound that has been implicated in the formation of acid rain contains one atom of sulfur and three atoms of oxygen                   SO(3)

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2. It is used to identify  properties of elements, understand properties of molecules
3. Elements with similar properties are called groups (families)
4. Two numbering conventions are used to label the groups
5. Older convention - uses Roman Numerals I through VIII followed by A or B
6. Other convention - numbered groups 1 - 18
7. The "A" groups are known as "Main Group Elements"
     - The "B" groups also known as "transition Elements" 
8. The horizontal rows, called periods are numbered 1 - 7
     - Periods all have the same energy level
9. The periodic Table is divided into 3 categories
     - Metals, located in the left and center of the table. They are good conductors of heat  and electricity, malleable, ductile, lustrous, and mostly solid at room temperature (except Hg, Mercury)
     - Nonmetals, located in the upper right hand corner. They are poor conductors of heat and electricity, lacking most of the properties that metals have
     - Metalloids, they are 6 elements on a diagonal line, called semimetals or    semiconductors because there conductivity is between metals and nonmetals
10. Most elements are very reactive, generally combined
11. Noble gasses and gases are found uncombined (gold,, platinum, silver)
12. Diatomic molecules are two of the same atoms bonded together]]> 2016-11-03 05:18:16 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984526 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984570  

This is a chemical reaction between 2 atoms of Hydrogen and one atom of Oxygen . These two atoms are chemically combined, they make a new substance but  the same molecules are still present. The mass of both the reactant and the product are the same. ]]> 2016-11-03 05:19:05 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984570 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984734 2016-11-03 05:21:23 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984734 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984767 2016-11-03 05:21:59 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134984767 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134985206

The difference between these Hydrogen Atoms is the atomic mass. They are all the same element because the protons stay the same, the only thing that changes in the number on neutrons. The first Hydrogen atom (Protium) has 1 proton and 0 neutrons. The second Hydrogen atom (Deuterium) has 1 proton and 1 neutron, showing that it is still a hydrogen atom. The third Hydrogen atom (Tritium) has 1 proton and 2 neutrons, the element is still Hydrogen just with a different number of neutrons.]]> 2016-11-03 05:29:37 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134985206 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134985282 2016-11-03 05:30:57 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134985282 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134985766 Red, Orange, Yellow Green - Metals
Blue- Metalloids
 Dark Blue, Purple - Non metals

]]> 2016-11-03 05:39:54 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134985766 19hsmith https://padlet.com/19jmeza2/trehxdg29t6s/wish/134985977 1. Metals - lose electrons to form positive ions (cations)
2. Nonmetals - gain electrons to form negative ion (anions)
3. The difference between an ion and an atom is the number of ELECTRONS
4. The more electrons the atom has the more spaced out it will become
5. The charge of electrons will be found in the upper right hand corner (superscript)
6. If you put a (-) in the charge you are gaining electrons
7. Ions can be negative or positive
8. The difference between protons and electrons is the protons will never change
9. First group = +1
    Second group = +2
    Aluminum = +3
10. Ionic compounds are made up from metals and nonmetals
      - metals are always listed 1st nonmetals 2nd
      - all metals are (+), nonmetals (-)
11. Ratio is subscript
        __# of metals__ (charge) + __# of nonmetals__ (charge) = 0
ex.  S & Al
       Sulfide Aluminum      __3__ (-2) + __2__ (+3) = 0
                                                  -6         +        6      = 0
                                                          S(3)Al(2)                         

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Fluorine atom received an electron from another atom and became a Fluorine ion. ]]> 2016-11-03 05:51:00 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134986186 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134986210

When you chemically combine these two atoms, the Sodium atom is giving an electron to the chlorine atom. The Sodium atom losses an electron and fills its outer most level, then chloride receives an electron which also fills the electron outermost level. Sodium becomes a cation and chloride becomes an anion. 

]]> 2016-11-03 05:51:25 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134986210 19jmeza2 https://padlet.com/19jmeza2/trehxdg29t6s/wish/134989279 Joe Meza
Hope Smith]]> 2016-11-03 06:42:21 UTC https://padlet.com/19jmeza2/trehxdg29t6s/wish/134989279