1.14 Intro to the periodic table

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The Periodic Table:

Group number - how many electrons are in the outer shell
Period number - how many occupied shells there are

Atom - Smallest part of something
Molecule - smallest unit of a compound

ATOMS

 All atoms are made up of protons electrons and neutrons, these are known as subatomic particles.

Image result for atom diagram

Every element is represented by a chemical symbol
e.g.

Image result for chemical symbol

Mass number = protons + neutrons
Atomic number = protons (equal to electrons)

Particle
Relative
mass
Charge
Proton
1
+1
Neutron
1
-
Electron
1/2000
-1



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