Nitrogen (N) has seven electrons. How many electrons are in the second shell of a nitrogen atom?

5

Explanation:

The first shell of an atom always contains 2 electrons, every other shell can contain up to 8 electrons each.

Five electrons

Explanation:

Nitrogen has 7 electrons --- 2 in the first shell, and 5 in the second shell (so five valence electrons). Oxygen has 8 electrons --- 2 in the first shell, and 6 in the second shell (so six valence electrons).

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.