Question

(i) Why is the second ionisation enthalpy of Ca is more than its first ionisation enthalpy​

Answer 1

Answer:The reason the second ionization energy is higher than the first relates to the attraction between the electrons and the nucleus. When one electron is removed from an atom, the neutral atom becomes positive. Thus, the second electron is harder to remove and the ionization requires more energy

Answer 2

The second ionisation enthalpy of every element is always greater than than its first ionisation enthalpy.

Because the nucleus attraction electrons all the time. The inner electrons are affected the most as they are near to nucleus. The valence electrons are less affected by this. So its easy to remove valence electrons.