The Periodic Table

1. The Periodic Table A Graphic Organizer

2. History • Mendeleev (1869)- published first periodic table • Organized by increasing atomic mass • Moseley(1913)- released table organized by increasing atomic number

3. Mendeleev’s Table

5. Parts of the Table • Groups (columns)-18 total • Periods (rows)- 7 total • Each square(key) usually contains: - name of element - symbol of element - atomic number of element - atomic mass of the element

6. A Closer Look • Symbol- one/two letters • Atomic number- tells element’s electron, proton number • Atomic mass- decimal number • Mass number- atomic mass rounded to nearest whole # • Mass number = protons + neutrons

7. The Periodic Law • There is a periodic repetition of physical and chemical properties on the periodic table • Each group has elements with similar chemical and physical properties • These groups have been assigned names

8. Alkali Metals • Located in group 1(hydrogen not included) • Most reactive of all metals • Soft metals

9. Alkaline Earth Metals • Located in group 2 • Harder than alkali metals • Not quite as reactive as alkali metals

10. Transition Metals • Found in groups 3-12 • Harder metals than groups1 and 2 • Very inert elements • Form colorful compounds

11. Groups 13 - 16 • Groups named for element at top of column • Contain a variety of elements (metals, nonmetals, metalloids)

12. Halogens • Group 17 • Most reactive nonmetals

13. Noble Gases • Group 18 • Most stable of all elements • Also called inert gases

14. Inner Transition Metals • Part of 2 periods (rows 6 and 7) • Lanthanides(elements 58-71) • Actinides(elements 90-103) • Many are radioactive • Many are synthetic • long form of periodic table

15. Metals, Nonmetals, Metalloids • Each element falls into one of these categories • Metals tend have the following properties: luster, malleable, good conductors, ductile, solids • Nonmetallic properties: dull, brittle, poor conductors, gases • Metalloids- contain properties of both (sometimes called semimetals)

16. Location of Metals, Nonmetals, Metalloids • Metalloids border the zigzag line • Metals-to the left of the zigzag line • Nonmetals- to the right of the zigzag line