January 13, 2016 Today’s Schedule Today you will need: Q/A Correct Worksheet Start Periodic Table Coloring Periodic Table Pass back test Today you will need: Pen/Pencil Paper/ Notebook Pencil Crayons if you have them

Q/A Break down the following compound to its elements and how many atoms of each element are there. 3 H2 (CrO4) 2

3 H2 (CrO4) 2 Hydrogen= 3 X 2 = 6 atoms Cromiun= 3 X 1 X 2 = 6 atoms Oxygen= 3 X 4 X 2 = 24 atoms

Put the mark clearly in the upper right hand corner. Add up the marks 1 point for each correct element Worksheet out of /25 Bonus mark for having question 10 correct Put the mark clearly in the upper right hand corner.

Counting atoms worksheet- Marks CaF2 Calcium= 1 Atom Fluorine= 2 Atoms NO2 Nitrogen= 1 atom Oxygen= 2 atoms Al2(SO4)3 Aluminum= 2 atoms Sulfur = 3 atoms Oxygen =12 atoms NH4NO3 Nitrogen= 2 atoms Hydrogen= 4 atoms Oxygen=3 atoms S2F2 Sulfur= 2 atoms Fluorine=2 atoms Na2CO3 Sodium= 2 atoms Carbon= 1 atom Oxygen= 3 atoms

Counting atoms Worksheet (Marks) CH4 Carbon= 1 atom Hydrogen= 4 atoms Al(C2H3O2)3 Aluminum= 1 atom Carbon= 6 atoms Hydrogen= 9 atoms Oxygen= 6 atoms (NH4)2Cr2O7 Nitrogen= 2 atoms Hydrogen= 8 atoms Chromium=2 atoms Oxygen=7 atoms 10) Bonus MARK! Calcium= 1 atom Oxygen= 8 atoms Carbon= 18 atoms Hydrogen= 14 atoms

THE PERIODIC TABLE AN INTRODUCTION

INVENTION OF THE PERIODIC TABLE DMITRI MENDELEEV invented this table in order to organize the elements Not only are they organized, they are organized in a way that explains and predicts their physical and chemical properties

MENDELEEV Russian scientist played solitaire with the 64 elements known at the time He first arranged them in order of increasing atomic mass When an element started to repeat properties he had seen before, he started a brand new row

His table:

Mendeleev’s Periodic Law If the elements are arranged according to their atomic mass, a pattern can be seen in which similar properties occur regularly.

Testing his Periodic Law Mendeleev had predicted that elements would be discovered to fill in the empty spaces in his periodic table His predictions were found to be accurate A century later, it is still used to summarize chemical facts

Mendeleev Video

The Groups on the Periodic Table

GROUPS OF ELEMENTS A set of elements in the same column (running up and down) are called a CHEMICAL GROUP or FAMILY These elements have similar physical and chemical properties They form similar kinds of compounds when they combine with other elements

Class Work Use the handout to colour the different groups of the periodic table. If you don’t have any pencil crayons, you may borrow mine. If you borrow mine, put them back after you are finished!