Atom Core Ideas

*Tells how many valence electrons

• group

• period

• atoms

• table

Go up and down on Periodic Table

• level

• period

• group

• table

 the center of an atom and has a positive charge

• element

• nucleus

• proton

• electron

Tells how many energy levels

• level

• group

• period

• column

positive charged atoms, 

made of metals, 

has more protons than electrons

• cation

• anion

• proton

• neutron

Negative charged atoms, 

made of non-metals 

has more electrons than protons

• cation

• anion

• protons

the number of protons in the nucleus of an atom

• mass number

• serial number

• element number

• atomic number

identical atoms 

having the same number of protons 

but a different number of neutrons

• ion

• isotope

• element

electrons that are found in the outer energy level of an atom 

has at max 8

• ions

• negative electrons

• valence electrons

an atom that has gained or lost electrons and has a charge

• ion

• valence electron

• isotope