Question

why the elements belonging to the same group do have similar chemical properties​

Answer 1

Answer:

table) have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali metals. Group 0 elements are unreactive non-metals called the noble gases.

The number of valence electrons in a particular group remains the same and this they have the same physical and chemical properties

Answer 2

Answer:

The chemical and physical properties of any elements rely on the quantity of valence electrons. In periodic table elements are in same group are having same quantity of valence electrons. This is why elements present in the same group are having similar chemical and physical properties.