Which of the following species contains 20 el | vedclass

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(B) To determine the number of electrons in each species,we look at their atomic numbers $(Z)$:$1$. For $K^{+}$: Atomic number of $K$ is $19$. Since i

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$Ca$

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(B) To determine the number of electrons in each species,we look at their atomic numbers $(Z)$:$1$. For $K^{+}$: Atomic number of $K$ is $19$. Since it is a cation with a $+1$ charge,it has $19 - 1 = 18$ electrons.$2$. For $Ca$: Atomic number of $Ca$ is $20$. As a neutral atom,it has $20$ electrons.$3$. For $Mg$: Atomic number of $Mg$ is $12$. As a neutral atom,it has $12$ electrons.$4$. For $Cl$: Atomic number of $Cl$ is $17$. As a neutral atom,it has $17$ electrons.Therefore,the species containing $20$ electrons is $Ca$.

Which of the following species contains $20$ electrons?

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