"mass number" is not "the/a" word, it is two words.
Mass number is the total number of protons and neutrons.
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 "mass production" of an item will cause its' price to fall.
What is the mass of that compound? We calculated the mass of the sample.
Mass wasting is hazardous and could kill you.
"atomic number" is not "the/a" word, it is two words.
The priest said Mass.
This room has to much mass. Mass is a synonym for density. I guess
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.
A planets gravity is caused by the distorting effect its mass has on the fabric of spacetime.
In that sentence, you can replace the word structure with the word mass, so that the question reads:"All but two percent of Antarctica's land mass is covered by ice."