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

The atomic number of the element from the following with lowest $1^{\text {st }}$ ionisation enthalpy is :
  1. $32$
  2. $35$
  3. $87$
  4. $19$

Asked in: JEE Main 2025 (08 Apr Shift 2)

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