An atom has a mass number of 25 and contains | vedclass

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(D) The mass number $(A)$ is given as $25$ and the number of neutrons $(n)$ is $13$. We know that $A = Z + n$,where $Z$ is the atomic number (number o

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$Mg^{+2}$

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(D) The mass number $(A)$ is given as $25$ and the number of neutrons $(n)$ is $13$. We know that $A = Z + n$,where $Z$ is the atomic number (number of protons). So,$Z = A - n = 25 - 13 = 12$. The element with atomic number $12$ is Magnesium $(Mg)$. The electronic configuration of $Mg$ is $2, 8, 2$. To achieve a stable octet,it loses $2$ electrons to form a $Mg^{+2}$ ion.

An atom has a mass number of $25$ and contains $13$ neutrons in its nucleus. What is the charge of its ion if it forms a stable octet?

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