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2. Law that states that the energy of the universe is constant.

3. The entropy of the universe is always increasing.

4. Ion containing a number of atoms.

5. A two element compound..

6. Law that states that the energy of the universe is constant.

7. A type of bond formed by the sharing of a three pairs of electrons

8. A type of bond formed by the sharing of a two pairs of electrons

9. A type of bond formed by the sharing of a single pair of electrons

10. The observation that atoms of nonmetals are most stable when they are surrounded by eight valence electrons

11. The diagram of a molecule showing how the valence electrons are arranged among the atoms in the molecule

12. A structure that consist of four surfaces or sides

13. The process of using a balanced chemical equation to determine the relative mass of reactants, and products involved in the reaction.

14. The number of protons within a nucleus of an atom.

15. A molecule that is composed of two atoms.

16. The number of protons and neutrons within a nucleus of an atom.

17. A particle outside of the nucleus of an atom that has a negative charge.

18. A particle with in the nucleus of an atom that has no charge.

19. The small dense center of an atom.

20. A particle of electromagnetic radiation.

21. A particle with in the nucleus of an atom that has a positive charge.

22. A measure of the disorder or randomness of the state of the universe.

23. A term that refers to the energy that flows as heat at constant pressure.

24. A unit of 6.022x10 23 molecules or atoms.

25. A process by which energy from a compound flows into the surroundings.

26. A process by which energy from the surroundings flow into a compound.