The possible formula of AC if A has 2 valence electrons and C has 7 valence electron is AC2.
- The number of valence electrons of an element can be used to predict the group it belongs to.
- This means that element A belongs to group 2 since it has 2 valence electrons while element C belongs to group 7 since it has valence electrons.
- Elements in group 2 (alkaline earth metals) have a of +1 while those in group 7 (halogens) has a charge of -1.
- These ions will be exchanged when these two elements come in contact. This means 1 will be A's subscript while 2 will C's subscript as follows: AC2.
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