A contractor will charge $1,160 to install a drop ceiling in a 15-by-20-foot room using 24-inch square panels, which includes the labor and material.If you have some carpentry experience you can buy the grid and panels for $300, the drop ceiling installation cost, saving 74 percent. contractor will charge $1,160 to install a drop ceiling in a 15-by-20-foot room using 24-inch square panels, which includes the labor and material.
Sodium was discovered at the Royal Institution in England by Sir Humphry Davy. Davy isolated sodium in 1807 through the electrolysis of sodium hydroxide. He used electrolysis to isolate other elements such as potassium, barium and magnesium.
Quick Answer. Sodium is a metallic element on the periodic table with an atomic number of 11 and an atomic mass of 22.98 amu. This atomic mass is calculated by adding together the number of protons and neutrons present in the atom's nucleus. Sodium was discovered by Sir Humphrey Davy in 1807.