NCERT Exemplar XIV — task. Science CBSE, Class 9.

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Calculate the number of neutrons present in the nucleus of an element X which is represented $_{15}\textrm{X}^{31}$ .

Given element is

$_{15}\textrm{X}^{31}$ .

Atomic number

$=$

Mass number

$=$

We know,

Atomic number

$=$ Number of

$=$ Number of electrons

Number of neutrons

$=$ .

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