Which element has the atomic number of 7?

The story behind the answer

Nitrogen has atomic number 7 because atomic number equals the number of protons in an atom’s nucleus. Hydrogen has 1, oxygen has 8, and neon has 10, so 7 uniquely identifies nitrogen. In the second period of the periodic table the sequence goes Li(3), Be(4), B(5), C(6), N(7), O(8), F(9), Ne(10).

Context: Nitrogen (N2) makes up about 78% of Earth’s atmosphere. Its molecules are held by a very strong triple bond, making atmospheric nitrogen relatively inert. Life relies on “fixing” this N2 into reactive forms (like ammonia), done naturally by certain microbes and industrially via the