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Across 2. The basic unit of a chemical element 3. liters, cubic meters, gallons, milliliters, teaspoons and ounces 10. The temperature at which a solid melts and turns to a liquid 11. Any of the elements fluorine, chlorine, bromine, iodine, and astatine 13. A change in the identity or characteristics of an atomic nucleus that results when it is bombarded with an energetic particle 17. A table of the chemical elements arranged in order of atomic number 19. Matter with no definite shape 20. The degree or intensity of heat present in a substance or object 22. A particle with a neutral charge 23. Gamma radiation 24. The continuous physical force exerted on or against an object by something in contact with it

Down 1. The temperature at which a liquid boils and turns to vapor 2. Any of the highly reactive elements lithium, sodium, potassium, rubidium, cesium, and francium 4. A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity 5. The action of dividing or splitting something into two or more parts. 6. A helium nucleus emitted by some radioactive substances 7. Pure chemical substance consisting of one type of atom 8. An electron emitted with high energy and velocity from a nucleus undergoing radioactive decay 9. The degree of compactness of a substance 12. The emission of energy 14. Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons 15. Any of the gaseous elements helium, neon, argon, krypton, xenon, and radon 16. Joining two or more things together to form a single entity. 18. A particle with a negative charge 21. A particle with a positive charge