Getting to know the Periodic Table

Objectives 1 To understand the design of the periodic table. Identify the important elements to know. 2 To introduce the concept of valence. How to use mass and number to find your way around the table 3 Active learning using prior knowledge.

Elements bingo (Rules) It´s a race Use your periodic table to help you You have 15 seconds to find and mark off the element

Plenary questions: How are you doing? 1. What is the atomic number of silicon? 2. What is the atomic symbol of Titanium 3. What is the atomic mass of copper? 4. Which is heavier – an atom of lead or an atom of gold? 5. Which element has the atomic number 27? 6. Which element has an atomic mass of almost 52? 7. Which element contains 16 protons? 8. Which element contains 42 neutrons and 33 protons? 9. Which element contains 4 more protons than carbon? 10. Which element do you think has isotopes of 35 and 37.? 11. Carbon has three isotopes: 12, 13 and 14. Which do you think is by far the commonest? Why?

Some key words 1. What are groups? 2. What are periods? 3. What does a group show? What does a period show?

Valence Column 1 gives 1 Column 7 takes 1 Any guesses why?What do all atoms want to have? Valence tells you how many electrons an element gives or takes when combining with another Metals usually giveNon metals usually take Number the columns from left to right: miss out the transition metals How many columns do you have? Column 8 can also be called column 0: any guesses why

Valences: complete the table ColumnWhat it does in a reaction Charge it getsValenceChemistry 1Gives 1 electron +11Thrilling 2Gives 2 electrons Pretty neat 3Rather dull 4Not sure 5Hard work! 6lively 7Takes 1 electron 1Dangerous 8nothingboringZZZZZzzzz!About as interesting as watching grass grow

The transition metals At the moment assume +2 unless told otherwise. You will often see the name written with a number in latin numerals. This number tells you its valence. E.g. Silver (I) nitrate has a valence of ? Lead (IV) chloride has a valence of ? If nothing is written assume 2. It is incorrect to write the names of transition metals without including their valence number. There were old-fashioned names like ferrous and ferric for iron (II) and Iron (III) but thankfully these have gone out of fashion!

Why Cos the pesky little electrons in other shells can jump up and down making it all confusing. In some transition metals like gold and platinum,this means that mostly they have no valence like the noble gases. How would you have known this?

Elements to know You don´t have to know the symbols of all the elements but you should know the common ones. Otherwise Chemsitry is like trying to write without knowing the letter sounds! Here is a link to the list you must learn. The document is under the title: “elements to learn”