Period 1: 2 elements
Period 2: 8 elements
Period 3: 8 elements
Period 4: 18 elements
Period 5: 18 elements
Period 6: 32 elements
Period 7: 25 elements
103
Two elements
alkali metal
The fourth period contains 18 elements beginning with potassium and ending with krypton – one element for each of the eighteen groups. It sees the first appearance of d-block (which includes transition metals) in the table. Do You Agree? Sincerely, Jocelyn E.Flowers
alkali metals
There are 2 elements in the first period, 8, 8 elements in 2nd and 3rd periods respectively,
There are two elements in the first period, hydrogen and helium.
2. hydrogen and something else
8 elements
103
Two elements
alkali metal
There are 18 elements in period 4.
there are 32 elements in period 6.
18
The fourth period contains 18 elements beginning with potassium and ending with krypton – one element for each of the eighteen groups. It sees the first appearance of d-block (which includes transition metals) in the table. Do You Agree? Sincerely, Jocelyn E.Flowers
alkali metals