I need the following terms defined with the fewest possible words.

1. Isotpes
2. hydrocarbons
3. alkanes
4. alkene
5. alkyne
6. isomers
7. solution
8. arrhenius solution

9. bronsted-lowry base

10. buffer

11. dilution

12. vapor

13. gas

14. specific heat

15. valence electrons

16. spectator ion

17. molecular geometry

18. measurement

19. atom

20. electron configuration

21. mole

22. polyatomic ion

23. electronnegativity

24. molecular compound

25. physical property