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Question
Give reason.
Alkali metals have low ionization enthalpies.
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Solution
- Across a period, the screening effect is the same while the effective nuclear charge increases.
- As a result, the outer electron is held more tightly, and hence, the ionization enthalpy increases across a period.
- Since the alkali metals are present in group 1 of the modern periodic table, they have low ionization enthalpies.
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