Question

An atom is determined to contain 12 protons, 10 electrons, and 12 neutrons. What are the mass number and charge of this atom or ion?

mass number: 24, charge: +2
mass number: 22, charge: neutral
mass number: 34, charge: -2
mass number: 34, charge: +2

Answer 1

The protons are equivalent to the atomic number, so we can determine that the element being expressed here is Magnesium. If you are ever stuck on what element you are finding your information from, just remember that the number of protons is the exact same as the atomic number in ANY situation :)

The charge of magensium is +2, with an atomic mass of 24. So A would be your answer :)