Chapter 21, Problem 95A

Interpretation Introduction

Interpretation:

The element having ground-state electronic configuration, needs to be determined.

Concept introduction:

The electrons are arranged around the nucleus of an atom in an increasing order of energy levels and this description of atomic orbitals of atom occupied by electrons is known as electronic configuration.

Answer to Problem 95A

The element having ground-state electronic configuration, is iron,

Explanation of Solution

Electrons are distributed in the orbitals the of subshell. The specific region of space in which the movement of electrons are confined is said to be shells which are divided into subshells and are s-, p-, d-, and f-. Among these subshells, the electrons are grouped as orbitals.

The number of electrons that these subshells can hold are:

s-block - 2

p-block - 6

d-block - 10

f-block - 14

The increasing order of energy of shells, subshell is:

As the number of electrons for a neutral atom is equal to the atomic number of an atom. So, the number of electrons in will be:

The atomic number of is 18 and 8 electrons in so, the total number of electrons is Thus, the element having atomic number 26 is represented by the ground-state electronic configuration, The element having atomic number 26 is iron,