Which of the following is an extensive property? MCQ with Answer and Explanation

Explanation:
Faraday's first law: m ∝ Q, where m = mass deposited, Q = charge passed (current × time). So mass deposited is directly proportional to the quantity of electricity (coulombs). While m ∝ I and m ∝ t individually are true for constant parameters, the exact law states m = ZIt = ZQ, where Z is electrochemical equivalent. The law directly links mass to Q. Faraday's second law deals with equivalent masses.

Explanation:
Groups (vertical columns) contain elements with the same number of valence electrons, leading to similar chemical properties. The modern table is based on atomic number; 7 periods exist; noble gases are in Group 18.

Explanation:
Gamma rays are high-frequency electromagnetic waves emitted from the nucleus. They have very high penetration power and are used in cancer therapy.