The atomic number of the element from the fol | vedclass

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Question

(C) The given atomic numbers correspond to the following elements:$32 \Rightarrow Ge$ (Germanium)$35 \Rightarrow Br$ (Bromine)$87 \Rightarrow Fr$ (Fra

Vedclass · Accepted Answer

$87$

Vedclass · Answer

(C) The given atomic numbers correspond to the following elements:$32 \Rightarrow Ge$ (Germanium)$35 \Rightarrow Br$ (Bromine)$87 \Rightarrow Fr$ (Francium)$19 \Rightarrow K$ (Potassium)Ionisation enthalpy generally decreases down a group and increases across a period.$Fr$ is an alkali metal located in the $7^{th}$ period and $1^{st}$ group.Due to its large atomic size and the shielding effect of inner shells,$Fr$ has the lowest $1^{st}$ ionisation enthalpy among the given elements.Therefore,the correct answer is $87$.

The atomic number of the element from the following with the lowest $1^{st}$ ionisation enthalpy is:

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