What is the Mass No. of Magnesium?

In chemistry, in the perdioic table, what would be the atomic mass number of Mg 2+ ?

Answers:
24.3050 g/mol. The amount of electrons does not affect the mass because an electron's mass is negligible. Mg2+ weighs the same as Mg.
^word
Here are some bits which I think would answer your question. I'm not sure if this bunch's complete enough to satisfy your craving for answers, but I hope you find it satisfactory enough.

Name: Magnesium
Symbol: Mg
Atomic Number: 12
Atomic Mass: 24.305 amu
Melting Point: 650.0 °C (923.15 K, 1202.0 °F)
Boiling Point: 1107.0 °C (1380.15 K, 2024.6 °F)
Number of Protons/Electrons: 12
Number of Neutrons: 12
Classification: Alkaline Earth
Crystal Structure: Hexagonal
Density @ 293 K: 1.738 g/cm3
Color: grayish
Name, Symbol, Number :magnesium, Mg, 12

(Atomic mass 24.3050(6) g/mol )
24. Electrons are not included in the mass because they just whizz around the nucleus. The atomic mass is the number of neutrons + number of protons.
24.3050
The atomic mass of Mg is 24 (or more accurately 24.305)
24

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