Across
- 4. something formed by a union of elements or parts
- 9. the mass of the products in a chemical reaction must equal the mass of the reactants
- 13. a substance that is a good conductor of heat and electricity, can be melted, and is usually capable of being shaped
- 14. the smallest particle of a substance that can exist by itself or be combined with other atoms
- 15. characterized by or formed with absorption of heat
- 16. any of a group of rare gases
- 17. a very small particle of matter that has no electrical charge
- 19. one of the basic substances that are made of atoms of one kind and that cannot be separated by ordinary chemical means into simple substances
- 20. only partially conducts electricity
- 22. a very small particle of matter that is part of the nucleus of an atom, and that has a positive electrical charge
Down
- 1. columns in the periodic table
- 2. the smallest possible amount of a particular substance
- 3. a very small particle of matter that has a negative charge of electricity
- 5. characterized by or formed with evolution of heat
- 6. of protons in a nucleus
- 7. a thin layer of metal that has been added to the outside of something
- 8. Russian chemist, created periodic table
- 10. a substance that changes when combined with another substance
- 11. the mass of an atom usually expressed in atomic mass units
- 12. has properties opposite of metals
- 17. the central part of an atom that is made up of protons and neutrons
- 18. the result of a process
- 21. a mathematically described region around a nucleus in a atom or molecule that may contain zero, one, or two electrons
- 22. rows going across the periodic table