chem
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The number of dots around the symbol is the number of valence electrons in the atom.
Do one for Flouride?
For HCN, the group number of C (group 4A) is lower than that of N (group 5A), making C the central atom. The bonding arrangements that will give each atom an octet are:
HCN contains an H atom (with one valence electron) a C atom (with four valence electrons) and an N atom (with five valence electrons) for a total 1 4 5=10 valence electrons. So only the structure with 10 electrons is valid.