An ion M^3-contains 10 electrons and 7 neutrons. What is the atomic number and mass number of the element M? Name the element.

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Solution

M^3-ion means it has gained 3 electrons.
Now M^3- has 10 electrons after gaining 3 electrons.
So M have 10 - 3 = 7 electrons
Atomic number = number of protons = original number of electrons
So the atomic number of the given ion is 7 which is nitrogen
Atomic mass = number of ( protons + neutrons)
= 7+7 =14 u
Therefore, the Atomic number of M^3- = 7
Atomic mass = 14 u
Element = Nitrogen

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