Question

what are the periods on the periodic table? And what are groups?

Answer 1

Answer:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

Answer 2

Answer:

Periods are the horizontal row of the periodic table.

There are 7 periods in modern periodic table.

Group are the vertical column in the modern periodic table.

There are 18 group in modern periodic table.