Question

Define ionization enthalpy. How does it vary along a period

Answer 1

Answer:

Ionization enthalpy of an element can be defined as the amount of energy required to remove an electron from an isolated gaseous atom in its gaseous state.

As we move from left to right across a period, the ionization energy of elements increases. ... The force of attraction between the nucleus and the electrons increases and hence more energy is required to remove an electron from the valence shell.