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Which one of the following is not an alkali metal?

Correct answer: C. Radium

  • A. Francium
  • B. Cesium
  • C. Radium
  • D. Rubidium

Explanation

RadiumHere's why:Francium, Caesium, and Rubidium are all part of Group 1 (also known as Group IA) in the periodic table, which corresponds to the alkali metals. They share characteristic properties like high reactivity, forming basic oxides and hydroxides, and having a single electron in their outermost shell.Radium, however, belongs to Group 2 (also known as Group IIA), which are the alkaline earth metals. While they share some similarities with alkali metals, they have some crucial differences. Most notably, alkaline earth metals have two electrons in their outermost shell and form divalent cations.Therefore, Radium's distinct position in the periodic table outside the group of alkali metals makes it the outlier in this option.

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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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