Ionic bonding

one atom gives up or gains electrons in order to have the same electronic configuration of stable nobel gases (a full outer shell).
Produce a cation when they lose electrons to form a positive ion
Produce an anion when gain electrons to form a negative ion

an atom with a positive or negative charge due to the loss or gain of one or more electrons.

1) Draw both original elements with one dotted electrons , one crossed
2) Draw arrow and both ions with gained/lost electron
3) Draw square brackets around both
4) Draw +/- charge

proton= atomic number
electrons= more or less depending on if they gain or lost any
neutrons= mass number- proton number

lose 1 electron (-)

lose 2 electrons (2-)

gains 2 electrons (2+)

gains an electron (+)

Compound contains just 2 elements and a negative ion

Compound contains 3 or more elements

If an element has a charge of 2+ and the other in the compound had only 1-, you'll need 2 of that 1- so you add a subscript. For example Calcium Bromide = CaBr2

Regular repeating arrangement of ions held together by strong electrostatic forces between oppositely charged ions