Q. 4.8 - An Introduction to General, Organic, and Biological Chemistry

Question

Identify the group or period number described by each of the following :

a. contains $\mathrm{Na}$, $\mathrm{K}$ and $\mathrm{Rb}$              b. begins with $\mathrm{Be}$

c. contains the noble gases           d. contains $\mathrm{B}$, $\mathrm{N}$ and $\mathrm{F}$

Step-by-Step Solution

Answer

a. Group $1A\left(1\right)$ contains data-custom-editor="chemistry" $\mathrm{Na}$,data-custom-editor="chemistry" $\mathrm{K}$and data-custom-editor="chemistry" $\mathrm{Rb}$

b. Group $2A\left(2\right)$ begins with beryllium

c. Group $8A\left(18\right)$ contains the noble gases

d. Period $2$ contains data-custom-editor="chemistry" $\mathrm{B}$,data-custom-editor="chemistry" $\mathrm{N}$and data-custom-editor="chemistry" $\mathrm{F}$

Part (a) Step 1 : Given information

We have to Identify the group or period number which contains $\mathrm{Na}$,$\mathrm{K}$ and $\mathrm{Rb}$.

Part (a) Step 2 : Simplification

• Analysing the periods and groups of modern periodic table.
• According to the modern periodic table Group$1A\left(1\right)$ contains $\mathrm{Na}$,$\mathrm{K}$ and $\mathrm{Rb}$
  

Part (b) Step 1 : Given information

We have to Identify the group or period number which begins with $\mathrm{Be}$

Part (b) Step 2 : Simplification

• Analysing the periods and groups of modern periodic table.
• According to the modern periodic table Group $2A\left(2\right)$ begins with beryllium.

Part (c) Step 1 : Given information

We have to Identify the group or period number which contains the noble gases.

Part (c) Step 2 : Simplification

• Analysing the periods and groups of modern periodic table.
• According to the modern periodic table Group $8A\left(18\right)$ contains noble gases.

Part (d) Step 1 : Given information

We have to Identify the group or period number which contains $\mathrm{B}$,$\mathrm{N}$and $\mathrm{F}$

Part (d) Step 2 : Simplification

• Analysing the periods and groups of modern periodic table.
• According to the modern periodic table period $2$ contains $\mathrm{B}$,$\mathrm{N}$ and $\mathrm{F}$.