Across
- 3. The smallest unit of an element that still has its properties
- 7. Elements with properties between metals and nonmetals
- 8. The change of state from a solid to a liquid when heat is added
- 10. The average mass of an element’s atoms based on isotopes
- 11. A substance formed when two or more elements are chemically bonded
- 13. A positively charged particle found in the nucleus of an atom
- 14. Scientist known for discovering the nuclear model of the atom
- 16. Atoms of the same element with different numbers of neutrons
- 18. Scientist who discovered the electron and proposed the plum pudding model
- 19. A pure substance made of only one type of atom
- 20. A comparison of an atom’s mass to a standard reference (carbon-12)
- 21. Elements that are generally poor conductors and not shiny or malleable
Down
- 1. A homogeneous mixture where one substance is dissolved evenly in another
- 2. A mixture where particles are spread through a liquid but will settle over time
- 4. A physical combination of two or more substances that are not chemically bonded
- 5. life The time it takes for half of a radioactive substance to decay
- 6. A horizontal row on the periodic table
- 9. A vertical column on the periodic table
- 11. A property of particles that can be positive or negative
- 12. Highly reactive metals found in Group 1 of the periodic table
- 14. A chemical reaction where iron reacts with oxygen and water to form rust
- 15. The emission of energy or particles from an unstable nucleus
- 17. Neutral particles found in the nucleus of an atom