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The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because:

Correct answer: A. There is increase in the nuclear charge of the alkaline earth metal

  • A. There is increase in the nuclear charge of the alkaline earth metal
  • B. There is decrease in the nuclear charge of the alkaline earth metal
  • C. There is no change in the nuclear charge
  • D. None of the above

Explanation

As the nuclear charge increases, it requires more energy to remove an electron (ionization energy). Hence, ionization energy will be increased. The first ionization energies of alkaline earth metals are higher than those of the alkali metals because of the increase in the nuclear charge of the alkaline earth metal. Therefore, option a is correct. Options b, c, and d are incorrect as they do not account for the increase in nuclear charge.

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About s-Block and p-Block Elements

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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