Question

which of the following atom(s) below has/have five valence electrons? a c b n c o d f

Explanation:

Step1: Recall valence - electron rules

Valence electrons are the electrons in the outermost shell of an atom. For main - group elements, the number of valence electrons can be determined from the group number in the periodic table.

Step2: Determine valence electrons of each option

• Carbon (C) is in group 14. It has 4 valence electrons.
• Nitrogen (N) is in group 15. It has 5 valence electrons.
• Oxygen (O) is in group 16. It has 6 valence electrons.
• Fluorine (F) is in group 17. It has 7 valence electrons.

Answer:

B. N