Chemistry

2. that which has mass and occupies space
6. another term for relative molecular mass
8. a standard or accepted way of doing or making something
10. an atom or molecule or group that has lost or gained one or more electrons
11. a close connection joining two or more people
14. an empirical method of acquiring knowledge
17. a substance that has been dissolved in another substance
18. a liquid necessary for the life of most animals and plants
19. a reaction accompanied by the release of heat.
20. a chain of atoms in a molecule that forms a closed loop

1. a very light colorless element that is one of the six inert gasses
2. a chemical element with the symbol Mg and atomic number 12.
3. a measurement that shows the number of hydrogen atoms that can combine with one atom of a particular chemical element to make a compound
4. conforming with the principles or methods used in science
5. an elementary particle with negative charge
7. organic compounds containing an amino group and a carboxylic acid group
9. one of the greatest of the ancient Athenian philosophers
12. consisting of uncombined atoms rather than molecules.
13. one of two or more atoms with the same atomic number but with different numbers of neutrons
15. a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions
16. a reaction accompanied by or requiring the absorption of heat.