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2. the number of protons in the nucleus of an atom
5. the sum of the numbers of protons and neutrons in the nucleus of an atom
6. the change of state from a liquid to a gas that usually occurs at the surface of a liquid over a wide rannge of temperatures
7. the change of state from a gas directly to a solid
9. in physical science, an atom's central region, which is made up of protons and neutrons
11. the smallest unit if an element that maintains the properties of that element
12. a subatomic particle that has a negative charge
14. the change of state from a liquid to a gas that occurs at a specific temperature
15. a subatomic particle that has no charge and that is located in the nucleus of an atom

1. the change of state from a solid directly to a gas
3. a subatomic particle that has a positive charge and that is located in the nucleus of an atom
4. the change of state from a gas to a liquid
8. a region around the nucleus of an atom where electrons are likely to be found
10. the change of state from a liquid to a solid
13. the change of state from a solid to a liquid