Periodic Table: Families

1. Periodic Table: Families March 3, 2014

2. The Periodic Table of the Elements: Families!

3. Stowe Periodic Table

4. A Spiral Periodic Table

5. Mayan Periodic Table

6. Families on the Periodic Table • Elements on the periodic table can be grouped into families bases on their chemical properties. • Each family has a specific name to differentiate it from the other families in the periodic table. • Elements in each family react differently with other elements.

7. Period The Periodic Table Group or Family Group or family Period

8. Metals, Nonmetals, Metalloids • There is a zig-zag or staircase line that divides the table. • Metals are on the left of the line, in blue. • Nonmetals are on the right of the line, in orange.

9. Metals, Nonmetals, Metalloids • Elements that border the stair case, shown in purple are the metalloids or semi-metals. • There is one important exception. • Aluminum is more metallic than not.

10. Metals • They are mostly solids at room temp. • What is one exception?

11. Properties of Metals • Metals are good conductors of heat and electricity • Metals are malleable • Metals are ductile • Metals have high tensile strength • Metals have luster

12. ALKALI METALS Group 1 • Hydrogen is not a member, it is a non-metal • 1 electron in the outer shell • Soft and silvery metals • Very reactive, esp. with water • Conduct electricity Image: http://www.learner.org/interactives/periodic/groups2.html

13. Alkali metals and water

14. Li Li H H H H O O + + Li Li H H - - O O H H Reactions with water All alkali metals react readily with water. The reaction becomes more vigorous down the group, and creates a lot of heat. + + + This reaction creates alkalinehydroxide ions. This is why the group 1 elements are called the alkali metals. The reaction also produces a gas that can be ignited by a lighted splint. What is this gas?

15. Videos!

16. ALKALINE EARTH METALS Group 2 • 2 electrons in the outer shell • White and malleable • Conduct electricity

17. Alkaline Earth Metals • They are less reactive than alkali metals, but they still react with water to produce H. • They are always combined in nature. Mg and Ca ions are found in seawater, and Ca is found in shells, which are made up of CaCO3.

18. More on alkaline earth metals • Properties: • They are harder than alkali metals. • They have a gray-white luster, but when they’re exposed to air, they form a tough, thin oxide coating. • Alloys with them generally have low densities. • Uses • Mg is used in asbestos, which was a common insulator until people discovered that it caused cancer. • Ca is in slaked lime, which is used in plaster and mortar.

19. TRANSITION METALS Groups in the middle • Good conductors of heat and electricity. • Some are used for jewelry. • The transition metals are able to put up to 32 electrons in their second to last shell. • Can bond with many elements in a variety of shapes.

20. Nonmetals • Nonmetals are the opposite of metals! • Some are solid, but many are gases, and Bromine is a liquid.

21. Propertiesof Nonmetals Carbon, the graphite in “pencil lead” is a great example of a nonmetallic element. • Nonmetals are poor conductors of heat and • electricity • Nonmetals tend to be brittle

22. BORON FAMILY Group 3 • 3 electrons in the outer shell • Most are metals • Boron is a metalloid

23. CARBON FAMILY Group 4 • 4 electrons in the outer shell • Contains metals, metalloids, and a non-metal Carbon (C)

24. NITROGEN FAMILY Group 5 • 5 electrons in the outer shell • Can share electrons to form compounds • Contains metals, metalloids, and non-metals

25. OXYGEN FAMILY Group 6 • 6 electrons in the outer shell • Contains metals, metalloids, and non-metals • Reactive

26. Halogens Group 7 • 7 electrons in the outer shell • All are non-metals • Very reactive are often bonded with elements from Group 1

27. Halogens • The halogen fluorine is the most reactive of the halogens in combining with other elements. • Iodine is the least reactive of the four nonmetals. • Chlorine is less reactive than fluorine, and bromine is less reactive than chlorine.

28. Halogen compounds Silver halides(e.g. silver chloride, silver bromide etc) These are used in photographic paper. They are reduced by light and x-ray radiation to leave a silver photographic image. Hydrogen halides(e.g. hydrogen chloride, hydrogen fluoride) When these dissolve in water they make acids and will turn universal indicator red.

29. Noble Gases Group 8 • Exist as gases • Non-metals • 8 electrons in the outer shell = Full • Helium (He) has only 2 electrons in the outer shell = Full • Not reactive with other elements

30. Discovery of argon The noble gases were discovered and isolated in the 1890s by William Ramsey, Lord Rayleigh, and Morris Travers. Noble gases had actually been first discovered, but not recognized, by Henry Cavendish in 1766. He had passed a series of electric sparks through a mixture of air and oxygen, and collected the gases that were produced. Each time he did the experiment, around 1% of the gas mixture did not react. Ramsay and his colleagues did further experiments and finally isolated a new element, which they called argon, from the Greek ‘argos’ meaning lazy or inactive.

31. Discovery of the other noble gases Once Ramsay had discovered argon, he realised that there was no place in the periodic table for it to fit. He predictedthat argon belonged to a whole new group of elements. In 1885 Ramsay identified helium, and in 1888 he identified neon, krypton and xenon after studying liquid air. Radon was discovered in 1900.

32. Rare Earth Metals • Some are Radioactive • The rare earths are silver, silvery-white, or gray metals. • Conduct electricity