1. 1

3. Give the atom notation for the following: 1) an atom with 82 p + and 126 n o 2) an atom of iron with 28 n o 3) an atom of element 29 having 34 n o

4. Information from the Periodic Table

5. Atomic Masses Measured in the unit amu –Stands for –Defined as 35 Cl = 34.9689 amu 50 V = 49.9472 amu 79 Br = 78.9183 amu

6. All Isotopes are NOT Created Equal Weighted averages

7. All Isotopes are NOT Created Equal Weighted averages An equation (oh crap) 35 Cl = 34.9689 amu –Abundance = 75.77% 37 Cl = 36.9659 amu –Abundance = 24.23%

8. 35 Cl = 34.9689 amu –Abundance = 75.77% 37 Cl = 36.9659 amu –Abundance = 24.23% All Isotopes are NOT Created Equal

9. 78.90% of all magnesium is 24 Mg  23.985 amu 10.00% of all magnesium is 25 Mg  24.986 amu of all magnesium is 26 Mg  25.983 amu A Problem! What is the average atomic mass of magnesium?

10. Some Algebra and a New Equation

11. DO NOT use If asked for If asked for ANYTHING else: Isotopes Calculation Summary

12. A Problem! Thallium has 2 isotopes, and. has a mass of 202.973 amu and has a mass of 204.974 amu. What are the percent abundances of each of the isotopes?

13. A Problem! Bromine has 2 isotopes, and. has a mass of 78.9193 amu and has a mass of 80.9163 amu. What are the percent abundances of each of the isotopes?

14. What is the percent composition of each element in strontium phosphite? Sr 3 (PO 3 ) 2 Percent Composition

15. A certain compound is 30.06% oxygen by mass and the rest is iron. How many kilograms of the compound are needed in order to obtain 35 kg of iron?

16. PeriodicTableof theElements Periodic: Having or marked by repeating patterns Table: An arrangement of words, numbers, or symbols, or combinations of them, as in parallel columns, to exhibit a set of facts or relations in a definite, compact, and comprehensive form Elements: A substance that cannot be broken down into simpler substances by chemical means

17. Metals: 87 of the 118 elements are metals. They appear _________________of the Periodic Table.  Some common properties of metals are:   (except ___________ which is a liquid)   

18. Metals

19. Nonmetals: Appear ___________________ of the Periodic Table. 17 elements are nonmetals. – Eleven are gases at room temperature (H, N, O, F, Ne, etc.) – Five are solids (C, P, S, Se, I) – One is a liquid (Br). – Nonmetals are poor conductors of heat and electricity.

20. Non-Metals

21.  Metalloids: Seven elements are metalloids.  Their properties are between those of metals and nonmetals.  Metalloids are semiconductors and are important to the electronics industry.

22. Metalloids

23. The Modern Periodic Table Mendeleev –Set it up the periodic table _______________________ Moseley –Set it up by ______________rather than ____________ Periodic Law –

24. The Modern Periodic Table Periods (series) – Groups (families) – – 2 different labeling systems

25. A few definitions… Main Group Elements: –Groups ____________________ Transition Elements: –Groups _____________________

27. Groups of Elements Vertical columns are called groups Group 1 = _____________________ Group 2 = _____________________ Group 17 = _____________________ Group 18 = _____________________

28. The Modern Periodic Table Main group elements –Also known as representative elements Transition metals Inner transition metals –Lanthanide series –Actinide series

29. Diatomic Elements Elements that exist as diatomic molecules when UNCOMBINED (meaning not in a compound with other elements).