1. The Periodic Table How the periodic table is put together

2. Who created it? Dimitri Mendeleev (1869) proposed the first version of The Periodic Table placed gaps in The Periodic Table to account for predicted discovery of new elements

3. So how is it arranged? Arranged by Increasing number of protons Properties the way elements look and act

4. You've got Your Periods... Horizontal rows are called PERIODS Period 1 = H and He Period 2 = Li, Be, B, C, N… Etc….

5. And you got your Groups… Vertical column are called GROUPS Group 1 = H, Li, Na, … Group 2 = Be, Mg, Ca, … Etc….

6. And you got your Groups… Main GROUP elements are “A groups” Groups 1,2,13-18 Transition GROUP elements are “B groups” Groups 3-12

7. What do all the numbers mean ? Atomic number (same as the number of protons) Average atomic mass (weighted average of various atoms of an element)

8. Family Time The Periodic Table is arranged by properties Shared properties = FAMILY

9. can explode if they are exposed to water All metals are malleable, ductile, conduct heat and electricity ALKALI METALS

10. AGAIN - All metals are malleable, ductile, conduct heat and electricity ALKLINE EARTH METALS

11. ONCE MORE- All metals are malleable, ductile, conduct heat and electricity Transition metals are Group B elements TRANSITION METALS

12. These 2 extra rows are included in transition metals TRANSITION METALS

13. Group 17 = halogens "halogen" means "salt-former" and compounds containing halogens are called "salts" HALOGENS

14. Group 18 = noble gases do not form compounds easily NOBLE GASES

15. METALS VS NON-METALS Metals on the left of the “staircase” (Ex: silver/gold/iron…) Non-metals on the right of the “staircase”

16. Atomic Radius “Size” of an atom Largest atom = bottom left Smallest atom = top right Electronegativity An atom’s ability to pull electrons towards itself Highest electronegativity = top right Lowest electronegativity = bottom left Non-metals have higher electronegativity (they’re closer to the top right) PERIODIC TABLE TRENDS

17. Ionization Energy Energy to pull an electron off of an atom Lowest ionization energy = less energy required = bottom left Highest ionization energy = more energy required = top right Non-metals have higher ionization energy (they’re closer to the top right) PERIODIC TABLE TRENDS