Chapter 21, Problem 21.42SP

Interpretation Introduction

(a)

Interpretation:

The given decreasing order of atomic radii $\left(Sc>Ti>V\right)$ needs to be explained.

Concept introduction:

The atomic radii can be described as the distance between the nucleus and the boundary of the electron's outer shell. It is also used to measure the size of the atom.

Interpretation Introduction

(b)

Interpretation:

The given increasing order of density $\left(Ti<V<Cr\right)$ needs to be explained.

Concept introduction:

The density of the substance can be described as the relationship between the mass of the substance and the volume of the substance. It is mathematically represented as follows:

$d=\frac{m}{V}$

Here, m is mass and V is volume.