Name ______________________________________ Date ___________ Block ______ Matter Reference 1. atom – the smallest unit of an element that can still be identified as that element 2. proton – subatomic particles with a positive charge 3. neutron –subatomic particles that do not have a charge; these particles are neutral 4. electron – subatomic particles with a negative charge 5. nucleus – the center of an atom which contains neutrons and at least one proton 6. mass – the amount of a substance 7. volume - the amount of space a substance occupies 8. density – the relationship between density and volume; calculated by dividing the mass by the volume 9. element – a pure substance with only one kind of atom; all the atoms have the same atomic number 10. atomic number – the number of protons 11. atomic mass – the mass of an atom 12. Periodic Table - an organized listing of atoms from lightest to heaviest 13. molecule - a combination of two or more atoms that are joined together chemically 14. compound - a substance made of atoms of two or more elements that are chemically combined 15. melting point – the temperature at which a substance changes from a solid to a liquid 16. boiling point - the temperature at which a substance changes from a liquid to a gas 17. sublimation - changing directly from a solid to a gas 18. physical change - a change that does not make a substance into a new substance; one or more of a substance’s physical properties is changed 19. chemical change – a change in which one or more new substances are formed 1 Atoms 1 Properties of Matter 2 Elements 2 Periodic Table 2 Reading the Periodic Table Matter 3 Molecules 3 Compounds 4 States of Matter 3 Mixtures 3 Solutions 5 Physical Changes 5 Chemical Changes .