Any element in the group 6 and period 3 (IUPAC version of periodic table).
The lightest element that is in period number 2 is lithium. Lithium is also the solid that is the least dense.
Period 2 (along with Lithium, Beryllium, Boron, Carbon, Nitrogen, Fluorine, and Neon.
Actinides
Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon.
Sulfur is a fourth period representative element that has similar properties to oxygen. Both elements belong to group 16 of the periodic table, also known as the oxygen group, and have similar chemical reactivity.
Magnesium
Neon
Oxygen is in period 2 on the periodic table. It is the 8th element in period 2.
Chlorine is an element in the same period as fluorine. Both elements are located in period 2 of the periodic table. They exhibit similar chemical properties due to being in the same period.
Calcium
Any element in the group 6 and period 3 (IUPAC version of periodic table).
In the same period as oxygen (O), you will find elements such as nitrogen (N), fluorine (F), and neon (Ne) on the periodic table.
The lightest element that is in period number 2 is lithium. Lithium is also the solid that is the least dense.
Sulfur is in the same period as phosphorus, carbon, nitrogen, oxygen, and magnesium.
Magnesium
Period 2 (along with Lithium, Beryllium, Boron, Carbon, Nitrogen, Fluorine, and Neon.