Question

In the modern long-form of periodic table, the horizontal rows and the vertical columns are called as __________ and ___________ respectively.

(a) groups, periods

(b) periods, groups

(c) rows, columns

(d) columns, rows

I have been asked this question in an interview for internship.

This question is from Modern Periodic Law and the Present Form of the Periodic Table topic in division Classification of Elements and Periodicity in Properties of Chemistry – Class 11

Answer 1

The correct answer is (b) periods, groups

Easiest explanation: In the most convenient and widely used periodic table of the long-form that is the modern version, the horizontal rows and the vertical columns are called as periods (series as per Mendeleev) and groups respectively.