18
The longest period is the sixth period, which contains thirty-two elements total.
18
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
8 elements
103
6th and 7th period are the longest period of the perodic table
The sixth period is currently known as the longest period because it has the most number of elements in it if you include the inter transition metals which are normally found in 2 columns at the bottom of a periodic table.
there are 32 elements in period 6.
There are 18 elements in period 4.
There are far to many elements following the 6th on in the Periodic Table. Included below is a link to a very nice Periodic table.
Uranium belongs to the actinide group of elements.
There are 2 elements in the first period, 8, 8 elements in 2nd and 3rd periods respectively,