"mass number" is not "the/a" word, it is two words.
Mass number is the total number of protons and neutrons.
What is the mass of that compound? We calculated the mass of the sample.
The Atomic Mass unit is a very useful way to get the properties of an element. This is a sentence which contains the word atomic mass unit.
mass means something massive.
The table that weighs 42 pounds has alot of mass
The "mass production" of an item will cause its' price to fall.
The cold air mass from the north did not move away.
Mass wasting is hazardous and could kill you.
This room has to much mass. Mass is a synonym for density. I guess
The priest said Mass.
"atomic number" is not "the/a" word, it is two words.
We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.