In s-block,on moving down the group,the react | vedclass

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(B) The reactivity of $s-$block metals with water and air depends primarily on their ability to lose electrons,which is determined by their ionization

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On moving down the group,the melting point decreases.

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(B) The reactivity of $s-$block metals with water and air depends primarily on their ability to lose electrons,which is determined by their ionization enthalpy. As we move down the group,the atomic size increases and the ionization enthalpy decreases,making it easier for the metal to lose electrons and thus increasing its reactivity. Option $A$ (atomic size) is significant as it directly influences ionization enthalpy. Option $B$ (melting point) is a physical property related to metallic bonding strength and does not dictate the chemical reactivity trend with water or air. Option $C$ (electron gain enthalpy) is generally not the primary factor for $s-$block metals,as they are electropositive and tend to lose electrons rather than gain them. However,since the question asks for the factor with 'no significance' for the reactivity trend,and both $B$ and $C$ are not directly responsible for the increase in chemical reactivity,but $C$ is often cited in periodic trends,$B$ is the most distinct physical property unrelated to the chemical reactivity mechanism.

In $s-$block,on moving down the group,the reactivity of metals with water and air increases. Which of the following factors has no significance for this trend of reactivity?

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