What is the molecular formula ofLi20?

Answer 1

'Li2O' IS the molecular formula.

It is lithium oxide which is an ionic combination of lithium cations and oxygen anions.

lithium ionise to form the lithium cation Li^(+)

Oxygen has electron affinity to form the oxide anion (O^(2-)

THe charges MUST balance and be of opposite characteristics.

Hence

Li^(+) + Li^(+) + O^(2-) = Li2O(s)

This is shortened to

2Li^(+) + O^(2-) = Li2O(s)

The ions come together by electrostatic attraction, like the N & S poles of a magnet.

It is an IONIC Molecule , NOT a covalent molecule.

Molecules can be the combination of either covalent or ionic atoms.

Answer 2

Lithium oxide does not exist as molecules, as it is an ionic compound.

Answer 3

The molecular formula of Li2O is Li2O.