Alkali Metals.
A group in Periodic Table is the column of element in periodic table
Calcium, Magnesium, and Radium are all in group two of the periodic table.
Group-1 elements are called alkali metals. They have one valence electron.
group 14
The element in period 4, group 7 of the periodic table is Manganese (Mn).
Argon (Ar, element number 18) is the last element in the third period of the periodic table.
This element is francium.
lithium
5
group 1
group 18
Seaborgium is in the group 6 of the periodic table.