Question

two representative elements, nitrogen and oxygen, are in the same period of the periodic table. which statement correctly describes the atoms of the two elements? (1 point)
they have valence electrons in different energy levels.
they have the same number of valence electrons.
they have valence electrons in the same energy level.
they have the same number of electrons.

Explanation:

Elements in the same period of the periodic table have their valence electrons in the same principal energy level. Nitrogen and oxygen are in the second - period. Nitrogen has 5 valence electrons and oxygen has 6 valence electrons, and they have different numbers of total electrons.

Answer:

They have valence electrons in the same energy level.