Question

e. The elements are arranged in Horizontal
rows called
(groups/periods).​

Answer 1

Answer:

Periods.................

plz follow me ❤️

Answer 2

Answer:

A modern periodic table arranges the elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column (Figure 2). ... The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.

I HOPE IT HELP YOU

PLEASE FOLLOW AND BRAINLIST ME