Which of the following species have 18 electr | vedclass

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Question

(A) $1$. To find the number of electrons: - $Ca$ (atomic number $20$) has $20$ electrons. $Ca^{2+}$ has $20 - 2 = 18$ electrons. - $K$ (atomic number

Vedclass · Accepted Answer

$Ca^{2+}, K^{+}, Cl^{-}, Ar$

Vedclass · Answer

(A) $1$. To find the number of electrons: - $Ca$ (atomic number $20$) has $20$ electrons. $Ca^{2+}$ has $20 - 2 = 18$ electrons. - $K$ (atomic number $19$) has $19$ electrons. $K^{+}$ has $19 - 1 = 18$ electrons. - $Na$ (atomic number $11$) has $11$ electrons. - $Cl$ (atomic number $17$) has $17$ electrons. $Cl^{-}$ has $17 + 1 = 18$ electrons. - $Ar$ (atomic number $18$) has $18$ electrons. Thus,$Ca^{2+}, K^{+}, Cl^{-},$ and $Ar$ have $18$ electrons. $2$. Isotopes of an element have the same atomic number,which means they have the same number of protons and electrons. Since chemical properties are determined by the electronic configuration (specifically valence electrons),all isotopes of an element exhibit similar chemical properties.

Which of the following species have $18$ electrons? $Ca^{2+}, K^{+}, Na, Cl^{-}, Ar$. Also,state the reason why the chemical properties of all isotopes of an element are similar.

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