Chapter 8, Problem 102A

(a)

Interpretation Introduction

Interpretation: The no. of electrons in the 2p sub-level of aluminum is to be determined.

Concept introduction:

The electron configuration of an element defines how its electrons are arranged throughout its atomic orbitals. Standard notation is used to represent atomic electron configurations, placing all electron-containing atomic subshells in sequential order. The number of electrons held by the subshell is indicated by superscript.

Answer to Problem 102A

6

Explanation of Solution

Atomic number of aluminum is 13 and its electronic configuration is as follows:

  $\text{Al}:1s^{2}2s^{2}2p^{6}3s^{2}3p^1$

Thus, no. of electrons in the 2p sublevel is 6.

(b)

Interpretation Introduction

Interpretation: The no. of electrons in the 2p sub-level of carbon is to be determined.

Concept introduction:

The electron configuration of an element defines how its electrons are arranged throughout its atomic orbitals. Standard notation is used to represent atomic electron configurations, placing all electron-containing atomic subshells in sequential order. The number of electrons held by the subshell is indicated by superscript.

Answer to Problem 102A

2

Explanation of Solution

Atomic number of carbon is 6 and its electronic configuration is as follows:

  $\text{C}:1s^{2}2s^{2}2p^2$

Thus, no. of electrons in the 2p sublevel is 2.

(c)

Interpretation Introduction

Interpretation: The no. of electrons in the 2p sub-level of fluorine is to be determined.

Concept introduction:

The electron configuration of an element defines how its electrons are arranged throughout its atomic orbitals. Standard notation is used to represent atomic electron configurations, placing all electron-containing atomic subshells in sequential order. The number of electrons held by the subshell is indicated by superscript.

Answer to Problem 102A

5

Explanation of Solution

Atomic number of fluorine is 9 and its electronic configuration is as follows:

  $\text{F}:1s^{2}2s^{2}2p^5$

Thus, no. of electrons in the 2p sublevel is 5.

(d)

Interpretation Introduction

Interpretation: The no. of electrons in the 2p sub-level of lithium is to be determined.

Concept introduction:

The electron configuration of an element defines how its electrons are arranged throughout its atomic orbitals. Standard notation is used to represent atomic electron configurations, placing all electron-containing atomic subshells in sequential order. The number of electrons held by the subshell is indicated by superscript.

Answer to Problem 102A

0

Explanation of Solution

Atomic number of lithium is 3 and its electronic configuration is as follows:

  $\text{Li}:1s^{2}2s^1$

Thus, no. of electrons in the 2p sublevel is 0.