Compare metals and non metals according to 1st ionization energies

Explanation:

Ionization energy is the minimum energy required to remove the most loosely bound electron from the outermost shell. Ionization energy increases across the period of the Periodic Table from left to right due to increase in the number of electrons as a result leading to increase in the resuling nuclear power. Therefore, from metals to non metals (across the period) , first Ionization energy increases.

fe 55.85 g/mol and h2o 18.02 g/mol.