Across
- 2. An element is the weighted average of the masses of all the naturally occurring isotopes of that element.
- 6. Atoms of the same element with differing numbers of neutrons.
- 7. The smallest of the main subatomic particles, each electron carries a single negative electrical charge.
- 9. Ions that have more electrons than protons have an excess of negative charge
- 10. A second kind of subatomic particle found in the nucleus, carries no electrical charge.
- 11. The mass number is the total number of protons and neutrons in an atom's nucleus.
Down
- 1. A new branch of physics was born, one that explored the behavior of matter and energy at the atomic and subatomic levels.
- 3. The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity and its position on the periodic table.
- 4. Ions that have more protons than electrons have an excess of positive charge
- 5. A subatomic particle that is located in the atom’s nucleus, carries a single positive electrical charge.
- 8. An atom or molecule that has gained or lost electrons, resulting in a net electric charge.