Group 2. Alkaline earth metals
2.magnesium plays a key role in the process that uses sunlight to produce sugar in plants.
Beryllium, magnesium, calcium, strontium, baryium, radium
The Noble gases
2.Their melting and boiling points are close together giving them a very narrow liquid range.
Halogens group 3
2.halogens are very reactive elements
- Fluorine (F) 9
- Chlorine (Cl): 17
- Bromine (Br): 35
- Iodine (I): 53
- Astatine (At): 85