Question

question 3
the vertical columns on the periodic table are called

because of their similar chemical behavior.

groups or families
rows
isotopes
periods

Explanation:

• In the periodic table, vertical columns are known as groups or families. Elements in the same group have similar chemical properties due to having the same number of valence electrons.
• Rows (b) are called periods. Isotopes (c) are atoms of the same element with different numbers of neutrons. Periods (d) are horizontal rows in the periodic table.

Answer:

A. groups or families