The modern periodic table has vertical columns known as-

Correct option is A

The correct answer is (a) Groups.
· In the modern periodic table, the vertical columns are known as groups.
· Each group contains elements with similar chemical properties due to having the same number of electrons in their outer shell.
Information Booster:
· Table: Refers to the entire periodic table, not specifically to columns.
· Periods: Refers to the horizontal rows in the periodic table.
· Columns: A general term, but in the periodic table, these are specifically called groups.