Answer :
On the basis of periodic trends, the element in each pair with the higher first ionization energy will be C, Ca, I, and F respectively.
The first ionization energy is the minimal amount of energy needed to remove an electron from the valence shell of a neutral isolated gaseous atom to form a univalent cation. First ionization energy in a group, drops from top to bottom, and moves from left to right over a period, it increases.
- The element having the highest 1st ionization energy between C and P is C.
- The element having a greater 1st ionization energy between Ca and Sr is Ca.
- The element with the greater 1st ionization energy between Sn and I is I.
- The element having the greater 1st ionization energy between F and S is F.
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