Question

define ionization enthalpy how does it vary along the period

Answer 1

Ionization enthalpy of elements refers to the total quantity of energyessential for an isolated gaseous atom to lose an electron in its ground state. Losing of electrons results in the formation of cations. ... As a result, the second ionization energy will be greater than the first ionization energy.
Variation along a period. Moving from left to right in a period, the ionization enthalpy increases with atomic number. Variation within a group. The ionization enthalpies keep on decreasing regularly as we move down a group from one element to the other.

Answer 2

Ionization enthalpy of elements refers to the total quantity of energyessential for an isolated gaseous atom to lose an electron in its ground state. Losing of electrons results in the formation of cations. ... As a result, the second ionization energy will be greater than the first ionization energy.

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