Chapter 5, Problem 43A

Interpretation Introduction

Interpretation: The number of electrons in the second-highest occupied energy of the atoms are to be identified.

Concept Introduction: Electronic configurations refer to the arrangements of electrons in different orbitals around atoms' nuclei.

Answer to Problem 43A

The number of electrons in the second energy level of chlorine atom is $8$ .

Explanation of Solution

Electronic configurations refer to the arrangements of electrons in different orbitals around atoms' nuclei.

The Aufbau principle, the Pauli exclusion principle, and Hund's rule are three rules that can be used to determine the electronic configuration of atoms.

To find the electrons in the highest energy level, the electronic configuration should be known.

The atomic number of element chlorine is 17.

The electronic configuration of the chlorine atom is written as follows:

  $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$

The second energy level of chlorine is 2s and 2p orbitals and the number of electrons is found by adding the superscripts of 2s and 2p orbitals.

The chlorine has $8$ electrons in the second energy level.

Interpretation Introduction

Interpretation: The number of electrons in the second-highest occupied energy of the atoms are to be identified.

Concept Introduction: Electronic configurations refer to the arrangements of electrons in different orbitals around atoms' nuclei.

Answer to Problem 43A

The number of electrons in second energy level of phosphorous atom is $8$ .

Explanation of Solution

Electronic configurations refer to the arrangements of electrons in different orbitals around atoms' nuclei.

The Aufbau principle, the Pauli exclusion principle, and Hund's rule are three rules that can be used to determine the electronic configuration of atoms.

To find the electrons in the highest energy level, the electronic configuration should be known.

The atomic number of the element phosphorous is 15.

The electronic configuration of the chlorine atom is written as follows:

  $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$

The second energy level of phosphorous is 2s and 2p orbitals and the number of electrons is found by adding the superscripts of 2s and 2p orbitals.

The phosphorous has $8$ electrons in the second energy level.

Interpretation Introduction

Interpretation: The number of electrons in the second-highest occupied energy of the atoms are to be identified.

Concept Introduction: Electronic configurations refer to the arrangements of electrons in different orbitals around atoms' nuclei.

Answer to Problem 43A

The number of electrons in second energy level of potassium atom is $8$ .

Explanation of Solution

Electronic configurations refer to the arrangements of electrons in different orbitals around atoms' nuclei.

The Aufbau principle, the Pauli exclusion principle, and Hund's rule are three rules that can be used to determine the electronic configuration of atoms.

To find the electrons in the highest energy level, the electronic configuration should be known.

The atomic number of element potassium is 19.

The electronic configuration of the chlorine atom is written as follows:

  $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$

The second energy level of potassium is 3s and 3p orbitals and the number of electrons is found by adding the superscripts of 3s and 3p orbitals.

The potassium has $8$ electrons in the second energy level.