Chapter 12.2, Problem 7RQ

Interpretation Introduction

Interpretation:

The symbols of ions from group 1, 2, 6, and 7 having configuration as argon are to written.

Concept introduction:

Electronic configuration represents the placement of electrons in various shells, sub-shells and orbitals of a particular atom.

Ions are formed by loss or gain of electrons.

Answer to Problem 7RQ

Symbols:

  $\begin{array}{l}Group1-K^{+}\\ Group2-C{a}^{2+}\\ Group6-S^{2-}\\ Group7-C{l}^{-}\end{array}$

Common electronic configuration:

  $1s^{2}2s^{2}2p^{6}3s^{2}3p^6$

Explanation of Solution

Atomic number of Argon is 18.

So, suitable element from group 1 is $K$ . It will lose one electron to get configuration as argon

Suitable element from group 2 is $Ca$ . It will lose two electrons to get configuration as argon

Suitable element from group 6 is $S$ . It will gain two electrons to get configuration as argon

Suitable element from group 7 is $Cl$ . It will gain one electron to get configuration as argon

Conclusion

Thus, atoms can get noble gas configuration after lose or gain of electrons.