Gallium (Ga)
The representative element in period 4 group 14 is silicon (Si). It is located in Group 14 of the periodic table, also known as the carbon group. Silicon is a metalloid that exhibits properties of both metals and nonmetals.
Selenium is located in Group 16, Period 4 of the periodic table. It is a nonmetal element with the symbol Se and atomic number 34.
The element in period 4, group 7 of the periodic table is Manganese (Mn).
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.
The element located in group 5, period 4 of the periodic table is zirconium (Zr). It has an atomic number of 40 and is a transition metal known for its high melting point and corrosion resistance. Zirconium is commonly used in nuclear reactors, as well as in various alloys and ceramics.
Chromium
On the periodic table group 4A is carbon, silicon, germanium, tin and lead. (aka "The Carbon Group")
In the periodic table, the Group 2, Period 4 element is calcium. Calcium is classified as a silvery-gray metal. Calcium is the most abundant of the metallic elements in the human body.
The representative element in period 4 group 14 is silicon (Si). It is located in Group 14 of the periodic table, also known as the carbon group. Silicon is a metalloid that exhibits properties of both metals and nonmetals.
The element in period 4 group 2A is calcium (Ca).
Chromium
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
Selenium is located in Group 16, Period 4 of the periodic table. It is a nonmetal element with the symbol Se and atomic number 34.
calcium
The element is krypton (Kr)