Atomic mass of an element measures the mass of that element on a molecular scale, taking into account neutrons and protons, which weigh approximately 1. Electrons are negated. Atomic mass is also the mass, in grams, of 1 mole of that element.
Nitrogen, element 7, has an atomic mass of 14.0067, rounded to 14.007.
Mercury has an atomic mass of 200.
Ne: 20.1797
Vanadium is the element that has an atomic weight of 50.942.