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Gallium (Ga)
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.
Germanium, belongs to period 4, group IVA (or group 14)
Ca or Calcium
The element is titanium and is in 4th period, group 4.
Chromium
Chromium
Gallium (Ga)
Br (Bromine) is a period 4 element in the same group as F.
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.
On the periodic table group 4A is carbon, silicon, germanium, tin and lead. (aka "The Carbon Group")
Germanium, belongs to period 4, group IVA (or group 14)
calcium
Two electrons imply that the element is in the second period. The 4 valence electrons says that it is located in group 4A (or group 14 in modern notation). Hence, this element is carbon.The element has 2 electron shells means the element is in the 2nd group. This element is carbon. It has 4 valence electrons.
There is no such element on the Periodic Table
element K, or potassium
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.