Question

Why do elements in the same group show similar properties but the elements in different group show different properties

Answer 1

Answer:

The number of electrons of all the elements down a group is the same..so they have the same electronic configuration and their chemical properties remain the same. However the number of electrons increases numerically from 1-8 across a period and so the elements have a varying electronic configuration and so have different chemical properties. Same is the case with physical properties.

Answer 2

Explanation:

Elements of a particular group have similar electronic configurations and the same number of valence electrons in their atoms. Hence, all the elements belonging to a certain group show similar properties. ... Different groups have different valencies. Therefore, elements in different groups show different properties