JEE Main Chemistry question

Following statements regarding the periodic trends of chemical reactivity to the alkali metals and the halogens are given. Which of these statements gives the correct picture? [AIEEE 2006]

(A)The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group.
(B)In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
(C)Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens.
(D)In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group.Correct

Answer: (D)

Solution

Down Group 1, atomic size increases and the single valence electron is lost more easily, so alkali-metal reactivity increases; down Group 17, although atomic size increases too, halogen reactivity (as oxidising agents, i.e. ability to gain an electron)

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Question ID VK-133163