Question

A Se ion has a mass number of 76 and a charge of − 2 . Determine the number of neutrons, protons, and electrons in this ion.

Answer 1

Answer:

Neutron = 42

Proton = 34

Electron = 36

Explanation:

The atomic number (also known as the proton number) of an element does not change even if the element gain or loss electrons.

With this understanding,

Se has atomic number(proton number) = 34

From question,

Mass number of Se ion = 76

Charge = - 2

Neutron number = Mass number - proton number

Neutron number = 76 - 34 = 42

Since Se ion has a charge of 2-, it means it has gain electrons

Therefore the electron number = 34 + 2 = 36

Answer 2

The Selenium ion has 42 neutrons, 34 protons, and 36 electrons.

HOW IS CHARGE OF AN ION DETERMINED?

• The charge of an ionic element is determined by the number of protons and electrons in its atom.

• The charge will be positive (+) if the number of protons is more than the number of electrons but will be negative (-) if otherwise. That is, charge = no. of protons - no. of electrons

• The atomic number of selenium, which is also the proton number is 34. Hence, since the charge is -2, this means that the no. of electrons in the Se-² ion is 36 i.e. 34 - 36 = -2.

• The number of neutrons can be obtained by subtracting the no. of protons from the mass no. i.e. 76 - 34 = 42 neutrons.

Therefore, the Se-² ion has 42 neutrons, 34 protons, and 36 electrons.

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