1. Atomic Number- the number of protons in the nuclues of the atom
2. Atomic Mass- the atomic mass of the element and its isotopes averaged together
3. Proton- a positive charge in the nucleus of an atom
4.Neutron- a neutral charge in the nucleus of an atom
5. Electron- a negative charge in the nucleus of an atom
6. Element- the simplest unit of matter
7. Compound- two or more different elements that are chemically bonded
8. Mixture- two or more different atoms that are not chemically combined
9. Solution- a type of homogenous mixture that can be separated by physical means
10. Suspension- a mixture that is not the same throuought and it considered heterogeneous
11. Period- rows of elements that gradually change as they go across
12. Group- columns of elements that have similar properties and the same number of valence electrons
13. Physical Change- a change that can be undone without a chemical reaction; Ex. melting ice
14. Chemical Change- a change that occurs through a chemical reaction; changes color, temperature changes, gas forms; Ex. frying eggs
15. Valence electrons- the electrons in the outermost shell of the atom
16. Ductile- not brittle
17. Malleable- bendable
18. Homogeneous- a mixture that is the same throughout, the properties are uniform, and it is evenly distributed (pure or mixture)
19. Heterogeneous- a mixture that is not evenly distributed, not the same throughout, not uniform (mixture)
20. Molecule- two or more atoms bonded together (same or different)
2. Atomic Mass- the atomic mass of the element and its isotopes averaged together
3. Proton- a positive charge in the nucleus of an atom
4.Neutron- a neutral charge in the nucleus of an atom
5. Electron- a negative charge in the nucleus of an atom
6. Element- the simplest unit of matter
7. Compound- two or more different elements that are chemically bonded
8. Mixture- two or more different atoms that are not chemically combined
9. Solution- a type of homogenous mixture that can be separated by physical means
10. Suspension- a mixture that is not the same throuought and it considered heterogeneous
11. Period- rows of elements that gradually change as they go across
12. Group- columns of elements that have similar properties and the same number of valence electrons
13. Physical Change- a change that can be undone without a chemical reaction; Ex. melting ice
14. Chemical Change- a change that occurs through a chemical reaction; changes color, temperature changes, gas forms; Ex. frying eggs
15. Valence electrons- the electrons in the outermost shell of the atom
16. Ductile- not brittle
17. Malleable- bendable
18. Homogeneous- a mixture that is the same throughout, the properties are uniform, and it is evenly distributed (pure or mixture)
19. Heterogeneous- a mixture that is not evenly distributed, not the same throughout, not uniform (mixture)
20. Molecule- two or more atoms bonded together (same or different)