The number of electrons in an element X is 15 | vedclass

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Question

(C) The atomic number $(Z)$ of an element is equal to the number of protons, which is equal to the number of electrons in a neutral atom. Here, the nu

Vedclass · Accepted Answer

$_{15}^{31}X$

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(C) The atomic number $(Z)$ of an element is equal to the number of protons, which is equal to the number of electrons in a neutral atom. Here, the number of electrons is $15$, so $Z = 15$.The mass number $(A)$ is the sum of the number of protons and neutrons. $A = Z + 	ext{number of neutrons} = 15 + 16 = 31$.The standard representation of an element is written as $_{Z}^{A}X$, where $Z$ is the atomic number (subscript) and $A$ is the mass number (superscript).Therefore, the correct representation is $_{15}^{31}X$.

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?

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