Question

Explain the variation of valency and ionization enthalpy
(a) Down the group
(b) Across the period​

Answer 1

Answer:

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Explanation:

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Answer 2

Valency. Valency in the periodic table across a period first increases and then decreases. There is no change going down a group. ... For this reason ionization energy is lower for elements lower down in a group, and polarizability of species is higher for elements lower down in a group.

The first ionization enthalpy of elements decreases as we move down in a group. While moving down in a group, atomic number increases and the number of shells also increases. Outermost electrons are far away from the nucleus and thus can be removed easily.

Trends in ionization enthalpy across a period:

As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.