Question

Isang bansang kinikilala ring kontinenteng pinakamaliit sa daigdig 9 words
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Answer 1

Answer:

Ionisation enthalpy

Alkali metals have the lowest

ionisation enthalpy compared to other

elements present in the respective period.

As we go down the group, the ionisation

enthalpy decreases due to the increase

in atomic size. In addition, the number

of inner shells also increases, which in

turn increases the magnitude of screening

effect and consequently, the ionisation

enthalpy decreases down the group.

The second ionisation enthalpies of

alkali metals are very high. The removal

of an electron from the alkali metals

gives monovalent cations having stable

electronic configurations similar to the

noble gas. Therefore, it becomes very

difficult to remove the second electron

from the stable configurations already

attained.

Hydration enthalpy

Lithium salts are more soluble

than the salts of other metals of group 1.

eg. LiClO4

is up to 12 times more soluble

than NaClO4

. KClO4

, RbClO4

and CsClO4

have solubilities only 10-3 times of that of

LiClO4

. The high solubility of Li salts is

due to strong solvation of small size of Li+

ion.