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

[JEE Main 2025, 8 Apr (Shift 1)]

Question

The atomic number of the element from the following with lowest ${1}^{\text{st }}$ ionisation enthalpy is : [JEE Main 2025, 8 Apr (Shift 1)]

YESPYQ · Accepted Answer

Correct answer: c) 87. Atomic no. 32 : Ge Atomic no. 35 : Br Atomic no. 87 : Fr Atomic no. 19 : K Lowest first I.E. among the given element will be of Fr [87]. Fr = [Rn] 7s 1

The atomic number of the element from the following with lowest \({1}^{\text{st }}\) ionisation enthalpy is : [JEE Main …

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