Nitrogen

Nitrogen has 7 protons, 7 neutrons, and 7 electrons. Nitrogen's atomic symbol is 7 and its atomic mass is 14.
The melting point of nitrogen is -210.1 degrees celsius and the boiling point is -195.8 degrees celsius. The main phase of nitrogen is gas.
The atom was believed to be discovered by a man named Henry Cavendish. The date he discovered the element is unknown.
Nitrogen is quite a cheap atom at a price of $0.01 per 25 grams