Identify the elements of alkali metals and al | vedclass

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Question

(B) $1$. Ionization enthalpy decreases down a group as the atomic size increases and the valence electrons are further from the nucleus.$2$. Alkali me

Vedclass · Accepted Answer

$Li$ and $Be$

Vedclass · Answer

(B) $1$. Ionization enthalpy decreases down a group as the atomic size increases and the valence electrons are further from the nucleus.$2$. Alkali metals $(Group \ 1)$ follow the order: $Li > Na > K > Rb > Cs$. Thus, $Li$ has the highest $1^{st}$ ionization enthalpy.$3$. Alkaline earth metals $(Group \ 2)$ follow the order: $Be > Mg > Ca > Sr > Ba$. Thus, $Be$ has the highest $1^{st}$ ionization enthalpy.$4$. Therefore, the correct pair is $Li$ and $Be$.

Identify the elements of alkali metals and alkaline earth metals respectively having the highest $1^{st}$ ionization enthalpy.

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