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(B) The number of protons $(Z)$ is calculated by subtracting the number of neutrons $(N)$ from the mass number $(A)$: $Z = A - N = 40 - 21 = 19$. Sinc

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${ }_{19}^{40} X$

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(B) The number of protons $(Z)$ is calculated by subtracting the number of neutrons $(N)$ from the mass number $(A)$: $Z = A - N = 40 - 21 = 19$. Since the atomic number is $19$,the element is potassium $(K)$. The standard representation of an element is ${ }_{Z}^{A} X$,where $A$ is the mass number and $Z$ is the atomic number. Substituting the values,we get ${ }_{19}^{40} X$. Therefore,the correct option is $(B)$.

What is the representation of an element having a mass number of $40$ and $21$ neutrons in it?

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