Classification of Elements and Periodicity in Properties

Classification of Elements and Periodicity in Properties

Question

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture? 

  • The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group

  • In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group

  • Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens

  • In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Answer

D.

In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

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