Matter

3. The _________ number tells us how many protons are in an atom of a particular element
6. Elements that are dull and cannot conduct electricity
9. O2 is an example of a _____________
11. The smallest particle into which an element can be divided
13. The larger the mass two objects have, the _______ the gravitational force is between those objects
14. Every element has a unique set of ________
15. Neon is an example of a ____________
17. Elements that are malleable and can conduct electricity
19. Mass divided by volume

1. Mass is measured in this unit
2. Two or more atoms of different elements that are chemically combined
4. Elements that have properties of both metals and nonmetals
5. When an object is dropped into a glass of water and floats, this means it has a density ______ than water
7. Anything that has volume and mass
8. The amount of space an object takes up
10. These particles within atoms are negatively charged
12. A pure substance that cannot be separated into simpler substances
16. This is where the protons and neutrons of an atom can be found
17. The amount of matter something has
18. The gravitational force on an object