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When a radioactive substance emits an α-particle, its position in the periodic table is lowered by which of the following?(a) One place(b) Two places(c) Three places(d) Four placesThe question was asked in an internship interview.Origin of the question is Atomic Masses and Composition of Nucleus topic in chapter Nucleus of Physics – Class 12

Answer»

Correct option is (b) TWO places

Explanation: When a radioactive SUBSTANCE emits an α-particle, its ATOMIC number decreases by a factor of 2. Therefore, its position in the periodic table is ALSO LOWERED by two places.



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