Question

An ion x^2+ contain 10 electrons and 12 neutrons . What are the atomic number and mass number of the element X? Name the element.

Answer 1

Answer: The element X is Magnesium (Mg)

Explanation:

Mg has an atomic number 12 (which is the number of neutrons or protons in that atom)

Now, Mg(+2) will have 10 electrons( which is also the same number of protons), since it is in +2 oxidation state, that is 2 electrons are removed from the atom to get the Mg(+2) ion.