Group-1 elements are called alkali metals. They have one valence electron.
A group in Periodic Table is the column of element in periodic table
Alkali Metals.
Calcium, Magnesium, and Radium are all in group two of the periodic table.
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.