calcium
The element in period 4 group 2A is calcium (Ca).
Br (Bromine) is a period 4 element in the same group as F.
The element in group 4 period 5 is Zirconium (Zr).
Germanium belongs to group IVA or group 14 and period 4
The element is krypton (Kr)
element K, or potassium
The element in Period 4 and Group 2 is Calcium, which has the chemical symbol Ca.
The element in period 4, group 7 of the periodic table is Manganese (Mn).
It is iron.
Krypton.
Element Name: Arsenic. Chemical Symbol: As.
There is no element with 28 protons in group 4. I think you are getting confused with group 4 and PERIOD 4. In period 4, the element with 28 protons is Nickel.