Periods in the periodic table are ____?
Periods in the periodic table are ____?
متواتر جدول میں ادوار ____ ہیں؟
Explanation
Periods in the periodic table are horizontal rows (left to right).
There are 7 periods in total.
Elements in a period have the same number of electron shells but different chemical properties.
Groups are the vertical columns in the periodic table.
There are 18 groups.
Elements in the same group have similar chemical properties and the same number of valence electrons.