The number of electrons and protons in the th | vedclass

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Question

(A) The alkaline earth metals are the elements of Group $2$ of the periodic table.The first three alkaline earth metals are Beryllium $(Be)$,Magnesium

Vedclass · Accepted Answer

$e = 18, p = 20$

Vedclass · Answer

(A) The alkaline earth metals are the elements of Group $2$ of the periodic table.The first three alkaline earth metals are Beryllium $(Be)$,Magnesium $(Mg)$,and Calcium $(Ca)$.The third alkaline earth metal is Calcium $(Ca)$,which has an atomic number of $20$.In a neutral Calcium atom,the number of protons is $20$ and the number of electrons is $20$.When it forms an ion $(Ca^{2+})$,it loses $2$ electrons.Therefore,the number of protons remains $20$,and the number of electrons becomes $20 - 2 = 18$.Thus,the number of electrons is $18$ and the number of protons is $20$.

The number of electrons and protons in the third alkaline earth metal ion $(Ca^{2+})$ will be:

Similar Questions

Name an element from Group $2$ which forms an amphoteric oxide and a water soluble sulphate.

Predict the feasibility of the given reactions in aqueous solution:
$(i)$ $Be(OH)_2 + 2 OH^{-} \longrightarrow [Be(OH)_4]^{2-}$
$(ii)$ $Be(OH)_2 + 2 H^{+} \longrightarrow Be^{2+} + 2 H_2O$

The solubility of carbonates of the alkaline earth metals decreases down the group. This is due to a decrease in which of the following?

Which of the following contains both calcium and magnesium?

Which one of the following is fluorspar?

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