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  • The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element? (a) _{15}^{31}X (b) _{16}^{31}X (c) _{15}^{16}X (d) _{16}^{15}X

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

(a) _{15}^{31}X

(b) _{16}^{31}X

(c) _{15}^{16}X

(d) _{16}^{15}X

Answers (1)

Answer: A

The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom.

Atomic number = Number of protons

It is represented with the letter ‘Z.’ The number of protons and neutrons combined to give us the mass number of an atom. It is represented using the letter ‘A.’

_{15}^{31}X is the correct representation of the element

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