The alkali metals are highly reactive elements. The reactivity of alkali metals is due to:
Correct answer: C. Both A and B
- A. Low value of ionization enthalpy
- B. Low enthalpy of atomization
- C. Both A and B
- D. Neither A nor B
Explanation
The reactivity of alkali metals is a result of both their low ionization energy and low enthalpy of atomization. The low ionization energy allows alkali metals to easily lose their valence electron, becoming positively charged ions. Simultaneously, their low enthalpy of atomization means that the metal atoms can easily break apart into individual atoms. Both of these factors contribute to the high reactivity of alkali metals. Option (c) is correct because it correctly identifies both factors affecting the reactivity of alkali metals. Options A and B are incorrect because they each reflect only one aspect of alkali metal reactivity, missing the complete picture.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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