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The Families of the Periodic Table

explains periods and groups, origin of periodic table and main families

Martha Schissler

on 4 February 2018

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Transcript of The Families of the Periodic Table

The Alkali Metals
Highly Reactive
Only have 1 valence electron
Soft, malleable, ductile metals
Good conductors and can explode in water
Can't occur in nature
Li, Na, K, Rb, Cs, Fr
Shiny and soft metals
Low densities and float on water
Readily combine with other elements (very reactive!)

Alkaline Earth Metals
Be, Mg, Ca, Sr, Ba, Ra
Shiny, silvery-white metals
Form compounds (oxides) with oxygen
Occur in nature and burn with bright, colourful flames
Noble Gases
Most unreactive elements
"don't mix with commoners"
Complete valence shells
Colourless odourless gases
He, Ne, Ar, Kr, Xe, Rn
F, Cl, Br, I, At
Reactive elements
Gases, a liquid and some solids
Can form poisonous compounds
The Families of the Periodic Table
Thank you!
Lets look at chlorine!
The periodic table is arranged in a very specific way-the rows across horizontally are called PERIODS
The columns (up and down) are
called groups or
different people have tried some wacky ways to organize the elements!
But Mendeleev was very SMART!
The First Family-The Alkali Metals!
How sad! That whole video was FAKE! They used depth charges in the bathtubs....You can't always believe what you see on the internet!
Tomorrow and Wednesday you will work in the library on your Periodic Table of.............. project! Have a look around the room at the ones on the bulletin boards.....they show trends going across the periods and in the families (columns) Can you see the trends?
All elements in period 1 have one shell
All elements in period 2 have two shells
All elements in period 3 have .......
see a trend?
All elements in group/family 1 have 1 valence electron
All elements in group/family 2 have 2 valence electrons
Full transcript