It is potassium.
The first element in the fourth period of the Periodic Table is potassium (K).
The first element in the fourth period of the periodic table is potassium (K).
The first element in the fourth period of the periodic table is potassium with the atomic number 19.
Potassium is the element that used to be first to make fertilizer.
hydrogen
Helium is in the first period of the periodic table.
Potassium
The first element in period three of the periodic table of chemical elements is sodium (Na).
Lithium is in the first period of the periodic table. It is the first element in the alkali metal group.
potassium
Period 1 refers to the top row of the periodic table. These elements are Hydrogen and Helium.
The A is Potassium