Answer: Mass number
If you look at the periodic table, you can simply find the mass number either on the top or bottom of the element.
Elements are made of only one kind of atom. The molecule is made up of two or more kinds of atoms. There is no physical change that can separate the compounds into more than one kind of substance. This makes a compound a pure substance.
Answer:
1. balance observation using "how much" = 5. quantitative instrument
2. graduated cylinder = 4. quantitaive instrument of volume
3. hypothesis proposed explanation= 7. qualitative descriptive observation
4. unit of volume= L
6. kg = primary unit of mass
Explanation:
there seem to be some typo error in uploading question but still it was clear to answer.
