Question

basis of electronic configuration around the nucleus, i) chemically similar element ii) First element of A period. iii)It belongs to Alkali metals iv) A group of halogen V) A group of inert gases​

Answer 1

Answer:

Explanation:

1)Which has same number of electron its valence shell has similar properties

2) Hydrogen and Helium in first period

3) Li, Na , K, (Outermost shell has 1 electron)

4) F,Cl,Br,I (Outermost shell has 7 electrons)

5) He,Ar,Ne,Kr,Xe,Rn (Outermost shell has 8 electrons except helium )

Answer 2

Explanation:

1 elements having the same number of valence electrons in their atoms will be chemically similar

2 hydrogen and helium in first period

3 Li , Na ,K