What are rows on the periodic table are known as?

1 Answer
Dec 15, 2016

Answer:

The horizontal rows are called #"periods"#........

Explanation:

The horizontal rows are called #"periods"#........hence #"Periodic Table"#, and the vertical columns are called #"groups"#. The #"periods"# and #"groups"# relate to electronic structure.

Atomic size decreases across a #"Period"# from left to right as we face the Table.........Why?