Question

Give the group and period numbers of each of the following elements: $(4.2)$

a. bromine

b. argon

c. potassium

d. radium

Short answer

a. The group is $17\left(7A\right)$and the period number is $4$.

b. The group is $18\left(8A\right)$and the period number is $3$.

c. The group is $1\left(1A\right)$and the period number is $4$.

d. The group is $2\left(2A\right)$and the period number is $7$.

Step-by-step solution

Part (a) step 1: Given Information 

We need to find the group and period numbers of bromine.

Part (a) step 2: Explanation

Bromine (Br) is in the group that is $17\left(7A\right)$and period is$4$.

Part (b) step 1: Given Information 

We need to find the group and period numbers of argon.

Part (b) step 2: Explanation

Argon (Ar) is in the group that is $18\left(8A\right)$ and period is$3$.

Part (c) step 1: Given Information 

We need to find the group and period numbers of potassium.

Part (c) step 2: Explanation

Potassium (K) is in the group that is and period is$4$.

Part (d) step 1: Given Information 

We need to find the group and period numbers of radium.

Part (d) step 2: Explanation

Radium (Ra) is in the group that is $2\left(2A\right)$ and period is$7$.