Chapter 4, Problem 79E

Interpretation Introduction

(a)

Interpretation:

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^1$ is to be stated.

Concept introduction:

The elements in a modern periodic table are arranged in increasing order according to their atomic number. In the modern periodic table, the horizontal rows are known as periods, and the vertical columns are known as groups. There are seven periods and eighteen groups in the modern periodic table.

Answer to Problem 79E

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^1$ is $\text{Li}$.

Explanation of Solution

Electronic configuration tells about the arrangement of an electron in each subshell and orbit of an atom. The electronic configuration of an element is ${\text{1s}}^{\text{2}}{\text{2s}}^1$. The electronic configuration of an element indicates that three electrons are present in it. According to the periodic table, the number of electrons corresponds to the atomic number of an element. Therefore, the element that has an electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^1$ is $\text{Li}$.

Conclusion

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^1$ is $\text{Li}$.

Interpretation Introduction

(b)

Interpretation:

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^2{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^2$ is to be stated.

Concept introduction:

The elements in a modern periodic table are arranged in increasing order according to their atomic number. In the modern periodic table, the horizontal rows are known as periods, and the vertical columns are known as groups. There are seven periods and eighteen groups in the modern periodic table.

Answer to Problem 79E

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^2{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^2$ is $\text{Si}$.

Explanation of Solution

Electronic configuration tells about the arrangement of an electron in each subshell and orbit of an atom. The electronic configuration of an element is ${\text{1s}}^{\text{2}}{\text{2s}}^2{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^2$. The electronic configuration of an element indicates that $14$ electrons are present in it. According to the periodic table, the number of electrons corresponds to the atomic number of an element. Therefore, the element that has an electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^2{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^2$ is $\text{Si}$.

Conclusion

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^2{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^2$ is $\text{Si}$.

Interpretation Introduction

(c)

Interpretation:

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{\text{2}}$ is to be stated.

Concept introduction:

The elements in a modern periodic table are arranged in increasing order according to their atomic number. In the modern periodic table, the horizontal rows are known as periods, and the vertical columns are known as groups. There are seven periods and eighteen groups in the modern periodic table.

Answer to Problem 79E

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{\text{2}}$ is $\text{Ti}$.

Explanation of Solution

Electronic configuration tells about the arrangement of an electron in each subshell and orbit of an atom. The electronic configuration of an element is ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{\text{2}}$. The electronic configuration of an element indicates that $22$ electrons are present in it. According to the periodic table, the number of electrons corresponds to the atomic number of an element. Therefore, the element that has an electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^1$ is $\text{Ti}$.

Conclusion

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{\text{2}}$ is $\text{Ti}$.

Interpretation Introduction

(d)

Interpretation:

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{10}{\text{4p}}^{\text{6}}{\text{5s}}^{\text{2}}$ is to be stated.

Concept introduction:

The elements in a modern periodic table are arranged in increasing order according their atomic number. In the modern periodic table, the horizontal rows are known as periods, and the vertical columns are known as groups. There are seven periods and eighteen groups in the modern periodic table.

Answer to Problem 79E

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{10}{\text{4p}}^{\text{6}}{\text{5s}}^{\text{2}}$ is $\text{Sr}$.

Explanation of Solution

Electronic configuration tells about the arrangement of an electron in each subshell and orbit of an atom. The electronic configuration of an element is ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{10}{\text{4p}}^{\text{6}}{\text{5s}}^{\text{2}}$. The electronic configuration of an element indicates that $38$ electrons are present in it. According to the periodic table, the number of electrons corresponds to the atomic number of an element. Therefore, the element that that has an electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{10}{\text{4p}}^{\text{6}}{\text{5s}}^{\text{2}}$ is $\text{Sr}$.

Conclusion

An element that corresponds to the electron configuration ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{2}}{\text{3d}}^{10}{\text{4p}}^{\text{6}}{\text{5s}}^{\text{2}}$ is $\text{Sr}$.