Across
- 2. the center of an atom, which contains the protons and neutrons
- 7. a negatively charged subatomic particle
- 12. solid, liquid, gas
- 14. basic unit of matter
- 15. protons, neutrons, electrons
- 16. An element found in group 17 of the periodic table
- 18. non-reactive elements in group 8A of the periodic table. Have no charge and are gases under normal conditions. (Helium, Neon, Argon, Krypton, Xenon, Radon)
- 20. two or more elements chemically bonded together
Down
- 1. Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorous, Sulfur, Selenium (CHNOPSSe)
- 3. number of protons and neutrons
- 4. A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.
- 5. An abbreviation for an element or atom
- 6. metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
- 8. a group of atoms chemically bonded together
- 9. highly reactive elements in group 1 of the periodic table
- 10. Elements that may accept or donate electrons readily and possess a mixture of metallic and nonmetallic properties
- 11. a row of elements in the periodic table; members of a period have the same total number of electron energy shells
- 13. elements that form a bridge between elements on the left and right sides of the periodic table
- 17. A column of elements with similar properties on the periodic table
- 18. A subatomic particle that has no charge and that is found in the nucleus of an atom
- 19. A positively charged particle found in the nucleus of an atom