1.  The Periodic Table Essential Question: How is the Periodic Table arranged?

2. Who created the first periodic table? Dmitri Mendeleev

3. How did he arrange his periodic table? Arranged the elements in order of increasing Atomic Mass He used this arrangement to predict the properties of elements

4. What problems did Mendeleev encounter? Some elements has similar Atomic Masses Ex. Co and Ni Ar and K So, he did not know where to place them on his Periodic Table

5. Who arranged the modern Periodic Table? Henry Moseley

6. How did Moseley arrange the Periodic Table? By increasing atomic number This is the arrangement used today

8. What is Periodic Law? Elements are arranged in order of increasing atomic number, based on their physical and chemical properties

9. What are horizontal rows called? Periods There are 7 periods They go from left to right on the periodic table

10. What are vertical columns called? They are called Groups or Families

11. What is special about Groups or Families? All elements in the same family behave the same They have similar Chemical and Physical properties

12. How to remember it? G R O U P E R I O D

13. Warm Up Element SymbolPeriod numberGroup number Potassium Oxygen Xenon For the following, fill in the Period number and Group number

14. More about the Periodic Table  Black symbols represent solids  Blue symbols represent liquids  Red symbols represent Gases

15. What are the three main groups of elements? 1. Metals 2. Non-Metals 3. Metalloids

16. Metals, Non-Metals and Metalloids

17. Warm Up Name some characteristics of Metals!

18. What are the properties metals?  Very good conductors of heat and electricity  Have luster  Ductile  Malleable

19. What is Ductility? Can be pulled out or drawn into wire

20. What is malleability? Can be bent without breaking

21. Where can I find metals on the Periodic Table? On the left side Almost 75% of the Periodic Table are Metals

22. What are the properties Non-metals?  Poor conductors of heat and electricity  Dull  Brittle

23. Where can I find Non-metals on the Periodic Table? On the right side

24. What about Metalloids? Notice the heavy, stair-step line? Metalloids border the line

25. What are the properties of Metalloids?  Semi- conductors of heat and electricity  Metallic in appearance but brittle

26. Where can I find a metalloid? Between the metals and the non- metals on the periodic table

27. What are Group 1 elements called? Alkali Metals Except for hydrogen

28. Group 1: Alkali Metals  They are the most reactive metals  They have one valence electron  They are softer than most metals can be cut with a knife  https://edpuzzle.com/media/5615 42ae5020d7e579e01417 https://edpuzzle.com/media/5615 42ae5020d7e579e01417

29. What are Group 2 elements called? Alkaline Earth Metals

30. Group 2: Alkaline Earth Metals  They are not as reactive as Group 1  They have two valence electrons  All occur in nature as compounds

31. What are Groups 3-12 called? Transition Metals

32. Groups 3-12: Transition Metals  They exhibit several oxidation states  Iron, Nickel and Cobalt are examples of some that produce a magnetic field

33. What are group 17 called? Halogens

34. Group 17 or 7: Halogens  Also known as group 7  Have seven valence electrons  They are the most reactive non-metal group

35. What are group 18 called? Noble Gases

36. Group 18 or 8: Noble Gases  Very unreactive  Noble gases have eight valence electrons  Their outer shell is completely full. They are happy.