Across
- 1. Uses the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level.
- 3. The small, positively charged center of the atom.
- 4. Particles in the nucleus with an electric charge of 1+.
- 6. The horizontal rows of elements in the periodic table.
- 8. The smallest particle of an element that retains the element’s properties.
- 11. The number of protons in an atom’s nucleus is equal to this.
- 12. Particles with an electrical charge of 1-. They occupy the space surrounding the nucleus of an atom.
- 13. Elements are arranged by increasing atomic number and by periodic changes in physical and chemical properties.
- 14. The vertical columns in the periodic table.
Down
- 1. The area around the nucleus of an atom where electrons are most likely to be found.
- 2. Small particles that make up protons and neutrons.
- 5. The weighted average mass of all naturally occurring isotopes of an element, measured in atomic mass units (amu), according to their natural abundances.
- 7. The sum of the number of protons and the number of neutrons in the nucleus of an atom.
- 9. Atoms of the same element that have different numbers of neutrons.
- 10. Electrically charged neutral particles in the nucleus, they do not have a charge.