Question

The I1 of potassium is 4.339eV/atom.the I1 of sodium

Answer 1

question is ---> The I1 of potassium is 4.339 eV/atom, the I1 of sodium

• 1) 4.339 eV/atom
• 2) 2.21 eV/atom
• 3) 5.138 eV/atom
• 4) 1.002 eV/atom

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. so, answer must be option (3).

Answer 2

Answer:

option 3 is correct

Explanation:

thank you