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Look at the group number at the top of . The column number at the top is the group number. For example, the column with Be at the top is group 2. The column with N at the top is group 15. You can relate group number to .

Group 1 has 1 valence electron.
Group 2 has 2 valence electrons.
Group 13 has 3 valence electrons.
Group 14 has 4 valence electrons.
Group 15 has 5 valence electrons.
Group 16 has 6 valence electrons.
Group 17 has 7 valence electrons.
Group 18 has 8 valence electrons, except for He, which has 2.

Ignore the transition metals in groups 3-12, or the middle block in the periodic table. They don't follow this rule.

So, for your question, because nitrogen (N) is in group 15, it has 5 valence electrons.

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