Composition and Classification of Matter

2. – The process of changing from liquid to gas.
4. – The smallest unit of matter that keeps the properties of an element.
9. – Atoms of the same element that have the same number of protons but different numbers of neutrons.
10. Number – The number of protons in an atom’s nucleus.
12. Theory – The idea that all matter is made of atoms.
14. – Matter with a fixed volume but no fixed shape (takes the shape of its container).
16. Substances – Matter made of only one kind of particle (like elements or compounds).
20. Mass – The total mass of an atom (protons + neutrons).
21. Mixture – A mixture where you can see the different parts (like sand and water).

1. Bonds – Bonds where atoms share electrons.
3. – Matter with a fixed shape and volume.
5. Bonds – Forces that hold atoms together in compounds.
6. Bonds – A type of covalent bond where electrons are shared unequally, making one side slightly negative and the other slightly positive.
7. Mixture – A mixture that looks the same throughout (like salt water).
8. – Anything that has mass and takes up space.
11. – A combination of two or more substances that are not chemically bonded.
13. Bonds – Bonds formed when atoms transfer electrons, creating positive and negative ions that attract each other.
15. – Pure substances made of only one type of atom.
17. – Tiny, negatively charged particles that move around the nucleus of an atom.
18. – Matter with no fixed shape or volume (spreads out to fill a space).
19. – Atoms that gain or lose electrons, giving them a charge.