Question

What does Z represent in the above graph?

(a) Atomic mass

(b) Atomic number

(c) Frequency

(d) Wavelength

This question was addressed to me at a job interview.

My doubt stems from Modern Periodic Law and the Present Form of the Periodic Table in chapter Classification of Elements and Periodicity in Properties of Chemistry – Class 11

Answer 1

The correct choice is (b) Atomic number

Easiest explanation: The above graph states Henry Moseley’s law, where v represents the frequency of X-rays emitted and Z depicts atomic number. It states that the atomic number is more prominent than atomic weight in case of periodic classification.