Chemistry Crossword

1. a subatomic particle that has a charge of +1
3. the SI base unit for volume
7. the sum of the atomic number and the neutrons
9. the SI base unit for time
10. a pure substance that cannot be separated into simpler substances
11. Negatively charged particles (-1)
13. the weighted average mass of the isotopes of that element
17. used to express numbers as a number between 1 and 10 multiplied by 10 raised to a power
18. the SI base unit for mass
20. a form of matter that flows, has constant volume, and takes the shape of its container
21. how close a measurement is to the accepted value

2. a tiny, dense region in the center of the atom
4. Atoms with the same number of protons but a different mass
5. organizes the elements into elements into a grid of horizontal rows called periods and vertical columns called groups
6. a subatomic particle that has the same mass of a proton, but carries no charge
8. how close together a set of measurements are
12. a form of matter that not only flows to conform to the shape of its container, but also fills the entire volume of its container
14. made up of two or more different elements that are combined chemically
15. the SI base unit for length
16. a property of matter that is mass per unit of volume
17. a form of matter that has its own definite shape and volume
19. the number of protons in an element
22. the smallest particle of an element that retains the properties of the element