Groups

Periods

Nucleus

Protons, neutrons and electrons relative mass/charge

Electrons shell structure

What is the mass number, no. of protons, electrons and neutrons?
23
Na
11

S
L
G
Aq

Covalent bonding

Ionic bonding

Ionic Formulae

Calcium: Ca+²
Sulphate: SO₄-²
Calcium Sulphate: CaSO₄

Magnesium: Mg₂
Hydroxide OH¹
Mg(OH)₂

Elextrons in the same group...
This means...