Given below is the electronic configuration of elements A, B, C, D.A)

1.	Given below is the electronic configuration of elements A, B, C, D.A) 1s2 2s21. Which are the elements coming within the same period?B) 1s2 2s2 2p6 3s22. Which are the elements coming within the same group?C) 1s2 2s2 2p6 3s2 3p33. Which are the noble gas elements?D) 1s2 2s2 2p64. To which group and period does the element ‘C’ belong?
Answer» According to electronic configuration A = Be B = Mg C = P D = Ne 1. A and D i.e. Be and Ne coming within the same period. [They have same valence shell (n = 2)] 2. A and B i.e., Be and Mg coming within the same group. [They have same valence subshell with same valency (2s² and 3s²)] 3. D, i.e. Ne is the noble gas element. [It has valency as ‘O’ and it has ‘8’ electrons in valence shell]. 4. Element ‘C’ i.e. ‘P’ belongs to 3 period and VA group.

Given below is the electronic configuration of elements A, B, C, D.A) 1s2 2s21. Which are the elements coming within the same period?B) 1s2 2s2 2p6 3s22. Which are the elements coming within the same group?C) 1s2 2s2 2p6 3s2 3p33. Which are the noble gas elements?D) 1s2 2s2 2p64. To which group and period does the element ‘C’ belong?

Answer»

According to electronic configuration A = Be B = Mg C = P D = Ne

1. A and D i.e. Be and Ne coming within the same period. [They have same valence shell (n = 2)]

2. A and B i.e., Be and Mg coming within the same group. [They have same valence subshell with same valency (2s² and 3s²)]

3. D, i.e. Ne is the noble gas element. [It has valency as ‘O’ and it has ‘8’ electrons in valence shell].

4. Element ‘C’ i.e. ‘P’ belongs to 3 period and VA group.