Periods Groups

Periods

Groups

i. The horizontal rows of elements in the modern periodic table are called as periods. ii. There are seven periods in the modern periodic table. iii. The period number indicates the number of electronic shells present in an atom of every element belonging to that period. iv. Elements show gradual variation in chemical properties along a period.

i. The vertical columns of elements in the modern periodic table are called as groups. ii. There are eighteen groups in the modern periodic table. ii. There are eighteen groups in the modern periodic table. iii. The group number indicates the number of electrons in the outermost shell of an atom of every element belonging to that group. iv. Elements belonging to a particular group show strong resemblance in their chemical properties.