Molecular Formula
Valence shell · Valency · Criss-cross method
Point out the valence shell and its electrons
Work out a valency from an electron arrangement
Say what a molecular formula is
Write a formula by the criss-cross method
Electrons settle in shells: 2, 8, 8
The outermost shell is the valence shell
The electrons in it are valence electrons
These are the electrons that react
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