Across
- 4. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
- 5. scientific symbol for francium
- 6. scientific symbol for titanium
- 7. scientific symbol for molybdenum
- 8. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
- 9. scientific symbol for tantalum
- 11. scientific symbol for niobium
- 12. scientific symbol for rubidium
- 14. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
- 15. the basic unit of a chemical element
- 17. a stable subatomic particle with a charge of negative electricity
- 19. scientific symbol for neon
Down
- 1. a table of the chemical elements arranged in order of atomic number
- 2. a subatomic particle of about the same mass as a proton but without an electric charge
- 3. scientific symbol for radon
- 10. stable subatomic particle that has a positive charge
- 13. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
- 14. scientific symbol for nihonium
- 16. referred to as a substance which has a certain mass and takes up a certain volume in space
- 18. scientific symbol for lithium