Question

An ion M2+ contains 10 electrons and 12 neutrons. What is the atomic number and mass number of the element M?

Answer 1

number of protons are 12 and electrons are 10 therefore atomic number is 12 and mass number is sum of neutrons and protons which is 12 + 12=24

Answer 2

Atomic number of M is 12, Mass number of the element M is 24 .

Solution:

If $\mathrm{M}^{2+}$ has 10 electrons it means the neutral atom M has 12 electrons.

Because, it loses 2 electrons to form an ion with positive charge 2.

A neutral atom with 12 electrons must have12 protons

$Mass number = Neutrons + Protons$

Atomic number = Number of Protons = electron

Mass number of $M = 12+12 = 24$ (Addition no. of Neutrons and protons)

Atomic number of $M = 12$ (No. of protons)

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