Chapter 3, Problem 3.1E

Identify the group and period to which each of the following elements belongs:

a. $\text{Si}$

b. element number $21$

c. zinc

d. element number $35$

Interpretation Introduction

(a)

Interpretation:

The group and period of the element $\text{Si}$ is to be stated.

Concept introduction:

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

Answer to Problem 3.1E

The group of the element silicon $\left(\text{Si}\right)$ is $\text{IVA}$ and it belongs to third period.

Explanation of Solution

The given element $\text{Si}$ is silicon. It has an atomic number of $14$. The element with this atomic number belongs to vertical column $14$ known as group $\text{IVA}$ and third horizontal row known as period $3$ in the periodic table. Thus, silicon, $\text{Si}$, belongs to group $\text{IVA}$ and period $3$.

Conclusion

The group and period of the element $\text{Si}$ is found to be $\text{IVA}$ and $3$ respectively.

Interpretation Introduction

(b)

Interpretation:

The group and period of the element number $21$ is to be stated.

Concept introduction:

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

Answer to Problem 3.1E

The group of the element number $21$ that is scandium $\left(\text{Sc}\right)$ is $\text{IIIB}$ and it belongs to fourth period.

Explanation of Solution

The given element number $21$ is scandium $\left(\text{Sc}\right)$. It has an atomic number equal to the element number $21$ as the elements are arranged in periodic table in order of their increasing atomic numbers. The element with atomic number $21$ belongs to vertical column $3$ known as group $\text{IIIB}$ and fourth horizontal row known as period $4$ in the periodic table. Thus, scandium $\left(\text{Sc}\right)$ belongs to group $\text{IIIB}$ and period $4$.

Conclusion

The group and period of the element number $21$, scandium $\left(\text{Sc}\right)$ is found to be $\text{IIIB}$ and $4$ respectively.

Interpretation Introduction

(c)

Interpretation:

The group and period of the element zinc is to be stated.

Concept introduction:

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

Answer to Problem 3.1E

The group of the element zinc $\left(\text{Zn}\right)$ is $\text{IIB}$ and it belongs to fourth period.

Explanation of Solution

The given element zinc has a symbol of $\text{Zn}$. It has an atomic number of $30$. The element with this atomic number belongs to vertical column $12$ known as group $\text{IIB}$ and fourth horizontal row known as period $4$ in the periodic table. Thus, zinc, $\text{Zn}$, belongs to group $\text{IIB}$ and period $4$.

Conclusion

The group and period of the element zinc $\left(\text{Zn}\right)$ is found to be $\text{IIB}$ and $4$ respectively.

Interpretation Introduction

(d)

Interpretation:

The group and period of the element number $35$ is to be stated.

Concept introduction:

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

Answer to Problem 3.1E

The group of the element number $35$ that is bromine $\left(\text{Br}\right)$ is $\text{VIIA}$ and it belongs to fourth period.

Explanation of Solution

The given element number $35$ is bromine $\left(\text{Br}\right)$. It has an atomic number equal to the element number $35$ as the elements are arranged in periodic table in order of their increasing atomic numbers. The element with atomic number $35$ belongs to vertical column $17$ known as group $\text{VIIA}$ and fourth horizontal row known as period $4$ in the periodic table. Thus, bromine $\left(\text{Br}\right)$ belongs to group $\text{VIIA}$ and period $4$.

Conclusion

The group and period of the element number $35$ that is bromine $\left(\text{Br}\right)$ is found to be $\text{VIIA}$ and $4$ respectively.