This is the thing called the mass number of the thing
Pressure varies in the atmosphere because air molecules are being pulled down towards the center of the earth-hope this helps!
Answer:
Explanation:
Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is ²³Na. The free metal does not occur in nature, and must be prepared from compounds.
They turn litmus paper blue
