Bright Tutorials Bright Tutorials
ICSE Class 10 Chemistry Question 5 of 25

Periodic Table, Periodic Properties and Variations of Properties — Question 14

Back to all questions
14
Question

Question 14

Which of these statements gives the correct picture regarding halogens and alkali metals with respect to an increase in the atomic number ?

  1. Reactivity decreases in alkali metals but increases in halogens.
  2. Reactivity increases in both.
  3. Reactivity decreases in both.
  4. Reactivity increases in alkali metals but decreases in halogens.
Answer

Reactivity increases in alkali metals but decreases in halogens.

Reason — Atomic number increases while going down the group in alkali metals and halogens. The tendency of losing electrons increases down the group. Reactivity of metals depends on tendency to lose electrons, thus reactivity of alkali metals increases while going down the group. Reactivity of non-metals depends on tendency to gain electrons, thus reactivity of halogens decreases while going down the group.