Mg is atomic number 12. For this reason it has actually 12 protons and also 12 electrons. The atom mass is 24, for this reason it has 12 neutrons together well.

You are watching: How many electrons are in mg 2+

Mg2+ is the cation of Mg which has actually lost 2 electrons (thus providing it a +2 charge). So,

Mg2+ has actually 12 protons, 12 neutrons and 10 electrons.

Hello, Emma,

Mg has atomic number 12, for this reason it has 12 protons. It has an atom mass the 24.3 amu (atomic fixed units). Protons and neutrons room 1 amu each. Electrons space close come 0 amu, and also are contained in the mass load calculations. That there room 12 protons, in ~ 1 amu each, we deserve to subtract 12 native the atom mass the 24.3 to acquire 12.3. The is all because of the neutrons. Picking the closest entirety number, we have the right to say the Mg has actually 12 protons and also 12 neutrons, for a full of 24 amu. The 0.3 is because of other Mg isotope containing an ext than 12 neutrons. The table is an mean of the isotopes found in nature. Electron aren"t cou nted in the mass. Since this is a 2+ cations, it way 2 of its 12 electrons have left, leave 10 electrons.

Bob

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