Chapter 8, Problem 8.42P

(a)

Interpretation Introduction

Interpretation:

The element with the configuration $\left[\text{Ar}\right]\text{}4s^{2}3d^{10}4p^2$ is to be identified. Also the symbols of the other elements in its group are to be written.

Concept introduction:

The atomic number is the number of protons present in the nucleus of the atom. It is a fundamental property of the atom. It is used to identify an atom and its chemical properties. It is also equal to the number of electrons in an uncharged species.

(b)

Interpretation Introduction

Interpretation:

The element with the configuration $\left[\text{Ar}\right]4s^{2}3d^7$ is to be identified. Also the symbols of the other elements in its group are to be written.

Concept introduction:

The atomic number is the number of protons present in the nucleus of the atom. It is a fundamental property of the atom. It is used to identify an atom and its chemical properties. It is also equal to the number of electrons in an uncharged species.

(c)

Interpretation Introduction

Interpretation:

The element with the configuration $\left[\text{Kr}\right]\text{}\text{}5s^{2}4d^5$ is to be identified. Also the symbols of the other elements in its group are to be written.

Concept introduction:

The atomic number is equal to the number of protons present in the nucleus of the atom. It is a fundamental property of the atom. It is used to identify an atom and its chemical properties. It is also equal to the number of electrons in an uncharged species.