Across
- 3. an arrangement of the elements in order of their atomic number
- 5. a pure substance made of only one type of atom that cannot be broken down
- 6. property of an element that you observe with your senses
- 7. the total count of protons and neutrons in an atom's nucleus
- 8. an atom or molecule with a net electrical charge because it has an unequal number of protons and electrons
Down
- 1. a letter of par of letters used to represent a chemical element
- 2. the number of protons in the nucleus of an atom
- 4. an area outside the nucleus where electrons are found