Identify the similarity in the atoms of pairs of elements given below:

1.	Identify the similarity in the atoms of pairs of elements given below:(i) Na (atomic number=11) and K (atomic number=19) (ii) B (atomic number=5) and C (atomic number=6)
Answer» (i) Both Na and K belongs to the same group (group I). Both contains same number of electrons in their valence shells i.e. 1 (ii) Both B and C belong to the same period (2nd period). Both contains same number of shells i.e. 2

Identify the similarity in the atoms of pairs of elements given below:(i) Na (atomic number=11) and K (atomic number=19) (ii) B (atomic number=5) and C (atomic number=6)

Answer»

(i) Both Na and K belongs to the same group (group I). Both contains same number of electrons in their valence shells i.e. 1

(ii) Both B and C belong to the same period (2nd period). Both contains same number of shells i.e. 2