Across
- 3. The total number of protons and neutrons in a nucleus.
- 4. Each of the actual or potential patterns of electron density that may be formed in an atom or molecule by one or more electrons.
- 6. A stable subatomic particle occurring in all atomic nuclei.
- 8. A stable subatomic particle with a charge of negative electricity.
- 9. Subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
- 11. Ice forming into liquid.
- 12. Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nucleimole
Down
- 1. Number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 2. With a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 5. The base unit of amount of substance in the International System of Units.
- 7. Basic unit of a chemical element.
- 10. A membrane-bound organelle that contains the cell's chromosomes.