January 2020 NY Regents Chemistry Exam
33 What is the number of valence electrons in a nitrogen atom in the ground state? (1) 5
(2) 2
(3) 7
(4) 14
Solution:Looking at the Periodic Table, Group 1 has 1 valence electron, 2 is 2 valence electrons, Group 13 is 3, 14 is 4, 15 is 5, 16 is 6, 17 is 7 and 18 is 8. Nitrogen is in Group 15 on the Periodic Table. We can also check its electron configuration as written on the Periodic Table which is 2-5. The last number is the number of valence electrons.
Answer: 1
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