chemistry

2. (2 words) a chemical bond in which the electrons are shared by atoms
5. iron (chemical symbol)
6. abbreviation for adenosine triphosphate
7. (2 words) the number of protons in the nucleus of an atom
10. (2 words) the orbital paths of electrons found at varying distances from the nucleus
14. carbohydrate molecule composed of more than two simple sugars
20. the tendency of an organism to sustain its chemical equilibrium under the challenge of a fluctuating external environment
22. positive charged ions
23. sulfur(chemical symbol)

1. carbon dioxide (chemical symbol)
3. (2 words) molecules that contain the element carbon and are the principal materials from which the structures of living things are formed
4. part of an atom that orbits around the nucleus and carries a negative charge
8. salt (chemical symbol)
9. magnesium (chemical symbol)
11. the ability to do work
12. sodium (chemical symbol)
13. large complex molecules consisting of chains of hundreds or thousands of amino acids
15. oxygen (chemical symbol)
16. carbon (chemical symbol)
17. water (chemical symbol)
18. abbreviation for deoxyribonucleic acid
19. K (chemical symbol for)
21. abbreviation for ribonucleic acid