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The mass number of an element is 63. It contains 29 electrons. What is the number of protons and neutrons in its nucleus ? Write the electronic configuration of the element ?

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1 Answers

In a neutral atom, number of electrons are equal to the number of proton.

No. of protons = No. of electrons = 29

Mass number = No. of protons + No. of neutrons

So, No. of neutrons (N) = Mass number - No. of protons

= 63 - 29

Number of neutrons (N) = 34

Electronic configuration : Electronic configuration is written on the basis of total number of electrons. So, the electronic configuration of the element is 2,8,18,1

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