Question

What is the group number and number of valence electrons for each of the following elements?

a. Potassium

b. Silicon

c. Neon

d. Aluminum

e. Barium

f. Bromine

Short answer

Group number and valence electrons of elements are:

(a) Potassium: Group is$1A\left(1\right)$; Valence electron =$1$

(b) Silicon: Group is$4A\left(14\right)$; Valence electron =$4$

(c) Neon: Group is$8A\left(18\right)$; Valence electron =$8$

(d) Aluminum: Group is $3A\left(13\right)$; Valence electron =$3$

(e) Barium: Group is $2A\left(2\right)$; Valence electron =$2$

(f) Bromine: Group is $7A\left(17\right)$; Valence electron = $7$

Step-by-step solution

Part (a) Step 1: Given Information

We need to find the group number and number of valence electrons for potassium.

Part (a) Step 2: Explanation

Because group number of potassium is $1A\left(1\right)$, potassium has one valence electron .

Part (b) Step 1: Given Information

We need to find the group number and number of valence electrons for silicon.

Part (b) Step 2: Explanation

Because group number of silicon is $4A\left(14\right)$, silicon has four valence electrons.

Part (c) Step 1: Given Information

We need to find the group number and number of valence electrons for neon.

Part (c) Step 2: Explanation

Because group number of neon is $8A\left(18\right)$ , neon has eighteen valence electrons.

Part (d) Step 1: Given Information

We need to find the group number and number of valence electrons for aluminum.

Part (d) Step 2: Explanation

Because group number of aluminum is $3A\left(13\right)$, aluminum has three valence electrons.

Part (e) Step 1: Given Information

We need to find the group number and number of valence electrons for barium.

Part (e) Step 2: Explanation

Because group number of barium is $2A\left(2\right)$, barium has two valence electrons.

Part (f) Step 1: Given Information

We need to find the group number and number of valence electrons for bromine.

Part (f) Step 2: Explanation

Because group number of bromine is$7A\left(17\right)$, bromine has seven valence electrons.