Chapter 2, Problem 2.40QP

(a)

Interpretation Introduction

Interpretation: The given ions that have the same number of electrons as an atom of krypton are to be stated.

Concept introduction: The addition of electrons in the valence shell which is the outermost shell gives the electronic configuration of anions and for cations; there is a removal of electrons firstly from the outermost p orbital, then from the s orbital and at last from the d orbital. Krypton is a group 18 element having atomic number 36 that has stable octet because of the fully filled orbitals and has electronic configuration $\left[\text{Ar}\right]{\text{3d}}^{\text{10}}{\text{4s}}^{\text{2}}{\text{4p}}^{\text{6}}$.

To determine: If the given ion, ${\text{Se}}^{\text{2-}}$ has the same number of electrons as an atom of Krypton.

(b)

Interpretation Introduction

To determine: If the given ion, ${\text{As}}^{\text{3-}}$ has the same number of electrons as an atom of Krypton.

(c)

Interpretation Introduction

To determine: If the given ion, ${\text{Ca}}^{\text{2+}}$ has the same number of electrons as an atom of Krypton.

(d)

Interpretation Introduction

To determine: If the given ion, ${\text{K}}^{+}$ has the same number of electrons as an atom of Krypton.