Question

explain the trends in ionisation enthalpy of 16 17 and 18 group elements​

Answer 1

Answer:

The elements of groups 16, 17 and 18 have a high ionisation enthalpy. In groups 16, 17, 18 the ionisation enthalpy decreases down the group, due to increase in atomic size.

Explanation:

Answer 2

High Ionization Enthalpy

Explanation:

• Group 16, 17 and 18 elements have a high ionization enthalpy.
• The ionization enthalpy decreases down the group, due to increase in atomic number in group 16, 17 and 18.
• The atomic size increases gradually as moving down the group due to addition of one new principle shell at each element.
• Along with addition of new shell, the shielding effect increases resulting  decrease in force of attraction between nucleus and valence electrons. Hence, ionization enthalpy should decrease.
• Increase in atomic number due to increase in nuclear charge results in force of attraction between nucleus and valence electrons leading increase in ionization enthalpy.