Across
- 2. The amount of energy required to move an electron from one energy level to another
- 7. _______ number is equal to the number of protons in the element
- 8. this type of property states that density depends on the type of matter present, not the amount of matter present
- 11. subatomic particle in the nucleus of an atom that distinguishes elements from each other
- 13. this substance has a density of 1 g/mL
- 15. a thoroughly tested model that explains why experiments give certain results; Scientific ______
- 16. the charge an atom will have if the number of electrons is greater than the number of protons
- 18. the last name of the person who proposed that electrons move in orbits and have fixed energy levels
- 19. a concise statement that summarizes the results of many observations and experiments; Scientific _____
- 20. anything that has mass and takes up space
- 21. the last name of the person who discovered the electron
Down
- 1. number of wave cycles passing a given point per unit time
- 3. region of space around the nucleus with a high probability of finding a given electron
- 4. the amount of three-dimensional space occupied by a substance
- 5. the study of matter and its changes
- 6. the formula for the speed of light is frequency multiplied by _______
- 9. the last name of the person who discovered that the atom is the smallest unit of matter, and it is indivisible
- 10. the order in which electrons are arranged around the nucleus of an atom is called electron ________
- 12. a quantum of light
- 14. two or more atoms chemically bonded
- 17. electrons in the outermost energy level