Question

What are the horizontal rows and vertical columns in a periodic table known as?

Answer 1

In a periodic table the terms used for horizontal rows and vertical columns are:

1. A periodic table is comprised of horizontal rows and vertical columns.
2. The rows extend from left to right and the columns extend from top to bottom.
3. The term used for horizontal rows is periods from $1$ to $7$, and the term used for vertical columns is groups from $1$ to $18.$
4. There are a total of seven periods and $18$ groups in the periodic table.
5. The properties of elements in a group are same.