Development of PT

1. Development of PT Agenda • Review • Notes on PT

2. What was the change?

3. Atom or ion p+ e- no Lewis dot Bohr’s Model 3115P-3

4. Ions or Isotopes 11p+ 12no 11p+ 11no

5. Mendeleev Song He was born in Russia in 1834. Hard work as a youth opened up the college doors. He always tried to be the best that he could be, and chose to make his mark in chemistry.

6. Who told the elements where to go? Mendeleev! • Who put them in columns and in rows? Mendeleev! • Who was ready, who was able to make a periodic table? Who was that chemistry? Mendeleev!

7. He wondered if nature really had a master plan; if the elements had a pattern that one could understand. So he bought a bunch of cards and on each one wrote the name of an element and its weight, and then he played the game!

8. Who told the elements where to go? Mendeleev! • Who put them in columns and in rows? Mendeleev! • Who was ready, who was able to make a periodic table? Who was that chemistry? Mendeleev!

9. He put them all in order by their atomic weight, used their chemical properties to differentiate. Groups began to form and despite some question marks, he managed to produce a simple periodic chart.

10. Who told the elements where to go? Mendeleev! • Who put them in columns and in rows? Mendeleev! • Who was ready, who was able to make a periodic table? Who was that chemistry? Mendeleev!

11. At first in 1869 the chart was not a hit, but that young Russian chemist was not the kind to quit! He revied atomic weights and staked his whole career, predicting that several new elements would appear. A few year passed and sure enough they came, Ga, Sc, Ge were their names. Chemists everywhere were impressed with that they saw, there really must be something to this periodic law.

12. Who told the elements where to go? Mendeleev! • Who put them in columns and in rows? Mendeleev! • Who was ready, who was able to make a periodic table? Who was that chemistry? Mendeleev!

13. So they call him the father of the periodic table, and his work gave rise to another kind of label. It’s the name for element number 101, in honor of this man they call it Mendelevium!

14. Mendeleev • Mendeleev also noticed the periodic pattern of element properties when arranged by atomic mass. • He was also able to predict the properties of elements that had not yet been discovered: Sc, Ga & Ge. • Some elements were not in the right spot based on mass (Mendeleev said masses were incorrect, but he was wrong.)

15. Mosley • Mosley arranged elements by atomic number. All elements fell into place with repeating properties. • The periodic law: there is a periodic repetition of chemical and physical properties of the elements when arranged by increasing atomic number.

16. METALS

17. Metals • lustrous – shiny • Solids – except for Hg • Conductors of heat & electricity • Malleable (hammer to flat sheet) • Ductile (draw into a wire)

18. NONMETALS

19. Nonmetals • Generally gases • Brittle • Dull-looking solids • Poor conductors of heat and electricity

21. Metalloids • Have properties of metals and nonmetals

22. Groups or Families The vertical columns on the periodic table Periods The horizontal rows on the periodic table Hint: called PT and we read left to right so periods go left to right! Vocab

23. Family Names • Alkali metals • Alkaline earth • Boron family • Carbon family • Nitrogen family • Chalogens • Halogen • Noble Gas

24. Transition Metals

25. Inner Transition Metals

26. Representative Elements = all group A elements