Question

An ion m 2+ contain 10 electron and 14 neutron what is the element name?

Answer 1

The given Ion has a charge of 2+
that means it has donated 2 electrons.
and it has 10 electrons left.
That mean if it were a neutral atom. It would've carried a total of 12 electrons.

In case of a neutral atom.
No. of electron = No. of protons = The atomic number.

Hence,
That element must have it's atomic number as 12.

and The element with Atomic number of 12 is Magnesium.
Hence your answer is magnesium.