What is the Mass Number?

What is the mass number of a hydrogen atom that has 1 neutron?

What is the mass number of a magnesium (Mg) atom that has 12 neutrons?

What is the mass number of an aluminum (Al) atom that has 14 neutrons?

What is the mass number of an argon (Ar) atom that has 23 neutrons?

What is the mass of an atom with 7 protons, 7 neutrons, and 8 electrons?

What is the mass number of a nitrogen atom that has 7 neutrons?