Across
- 4. mass The sum of the number of protons and neutrons in the nucleus of the atom.
- 5. table The elements are arranged by increasing atomic numbers and by changes in physical and chemical properties.
- 7. protons and neutrons are found in a small, positively charged center of the atom that is surrounded by a cloud containing electrons.
- 9. is normally colorless, odorless, and tastless.
- 12. Is shinney at room temp and turns gray when exposed to air.
- 13. The horizontal line of elements on the periodic table.
- 17. Atoms of the same elements that have different numbers of neutrons.
- 18. A building block of subatomic particles.
Down
- 1. number The number of protons in an atom is equal to a number.
- 2. The salt form of a liquid or gas element.
- 3. Particles with an electric charge of 1-.
- 6. The vertical columns in the periodic table.
- 8. The smallest piece of matter that still retains the property of the elements.
- 10. Is made up of heium and oxygen fused together.
- 11. are Natural particles that do not have an electric charge.
- 13. Particles with an electric charge of 1+.
- 14. Cloud The area around the nucleus of an atom where its electrons are most likely found.
- 15. 1oz can be stretched into a thread 5 miles long.
- 16. is the second most abundant element.