Question

The period’s number corresponds to the highest _________

(a) Azimuthal quantum number

(b) Spin quantum number

(c) Magnetic quantum number

(d) Principal quantum number

This question was addressed to me in an online interview.

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

Answer 1

Correct choice is (d) Principal quantum number

To explain: As seen in the most convenient and widely used periodic table of the long-form that is the modern version, the horizontal rows that depict period number represent the highest principal quantum number of the atoms in the period.