Question

The ie1 of potassium is 4.339 and the le1 of sodium is

Answer 1

Explanation:

actually, this question is based on properties of elements in periodic table.

ionisation enthalpy is the amount of energy required to remove an electron from ground state of an isolated gaseous atom.

means, bigger the size of atom, lower will be ionisation enthalpy.

but we know, size of atom increases when we move down the group.

so, size of potassium > size of sodium

and hence, I1 of potassium < I1 of sodium.

only option (3) is larger than 4.339 eV/atom