GK QUESTION#3472
Consider the following statements.
1. Henry Moseley established atomic number through cathode-ray experiments.
2. Moseley’s law helped establish the ordering of the periodic table by atomic number.
3. Atomic number represents the number of protons in the nucleus.
Which statements are correct?
Show Answer
Answer
B. 2 & 3 only
Show Explanation
Explanation
Moseley studied characteristic X-rays, not cathode rays, so statement 1 is false. His work established atomic number as the fundamental ordering quantity for the periodic table. Atomic number equals the number of protons in the nucleus. Statements 2 and 3 are correct.