1. Review for PS-2 – Properties of Atoms

2. Atoms are made up of – Protons – Neutrons – Electrons

3. What type of charges do all particles have – protons= positive – Electrons= negative – Neutrons= neutral

4. Where is everything in an atom located? – Protons – nucleus – Neutrons- nucleus – Electrons- electron cloud or energy level

5. How much does each particle weigh? – Protons- 1 amu – Neutrons-1 amu – Electrons- 0 amu

6. Periods are ____________________ horizontal Groups are ____________________ vertical

7. The maximum number of electrons that the first energy level? Second energy? can hold is 2 8

8. What are the symbols for Chlorine and Magnesium? Cl Mg

9. Can the EXACT location of the electron be located? NO

10. The identity of an atom is determined by its Number of protons The group number of an atom indicates its Number of valence electrons AND its chemical properties

11. How do you find the number of neutrons? MASS NUMBER- ATOMIC NUMBER How do you find the number of protons of an atom? ATOMIC NUMBER How do you find the mass number? Add the number of neutrons that the problem gives you to the number of protons

12. The smallest unit of matter is The atom

13. What are the names of groups 1,2,17 and 18 Alkali metals, alkaline earth metals, halogens and noble gases

14. If an atom loses electrons, it is a _________ ion? positive

15. Lewis dot diagrams are used to represent _________. Valence electrons

16. At room temperature most non-metals are _________________ gas

17. Neutrons released in a fission reaction could cause a ________ ____________. Chain reaction

18. For Magnesium, what is the… Atomic number- 12 Average atomic mass-24.31 Number of neutrons-12 Number of valence electrons-2 Oxidation number +2 Group number 2 Period number 3

19. What is an isotope? Same atom (element) with a different number of neutrons and a different mass number

20. Draw a Lewis structure and a Bohr’s model for oxygen

21. A ___________ reaction is a nuclear reaction that involves the joining of two or more nuclei of atoms Fusion A ___________ reaction is the splitting of nuclei. fission

22. Like charges ____________. Repel Unlike charges __________. attract

23. Write the isotope notation for the three isotopes of H. H-1 OR H-2 OR H-3 OR

24. What are some benefits of radioactive isotopes? Diagnosing medical problems, dating fossils What are some benefits of nuclear reactions? Power reactors, treatment of cancer