Across
- 2. a substance formed when two or more chemical elements combine in a fixed ratio
- 5. structure of an atom
- 9. has a pH greater than 7
- 12. a charged atom or molecule
- 13. Atoms with the same number of protons but different numbers of neutrons
- 18. Vertical columns on the periodic table
- 19. a variable that stands alone and isn't changed by the other variables you are trying to measure
- 20. consist of a nucleus proton and neutron
- 21. a negatively charged ion
- 23. Horizontal row on the periodic table
- 24. relies on another variable
- 25. A substance with high electrical conductivity, luster, and malleability,
- 26. A scale that says how acidic or basic something is
- 27. Circles around the nucleus
- 28. Releases heat
Down
- 1. a conclusion reached on a basis of evidence and reasoning
- 3. observing something
- 4. Takes heat in
- 6. a representation of a chemical compound
- 7. changes appearance after a reaction
- 8. A mass of an atom
- 10. unpaired valence electrons
- 11. Lacks characteristic of a metal
- 13. Shares valence electrons with other atoms
- 14. a chemical that gives off hydrogen ions
- 15. the number of a chemical
- 16. A chemical reaction between an acid and a base
- 17. forms a new substance when a reaction happens
- 22. Electrons in the outer shell of an atom
- 25. an orbit that electrons follow around an atom's nucleus.