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Mendeleev
Created the first periodic table in 1869
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Metals
Anything left of the bold stair case, good conductors
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Non-metals
Poor conductors
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Metalloids
Okay conductors
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Group 1
Alkaline (have one valance e-)
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Group 2
- Alkaline Earth Metals
- ( have two valance e-)
- reactive
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Group 17
- Halogens
- (have seven valance e-)
- Very reactive
- all states of matter
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Oxidation Number
The charge acquiered by an element or group of elements when combining to form compounds
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Atomic Radius
- Size of atom
- Period: Decreses (proton pull)
- Group: Increses (adding energy levels)
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Ionization Energy
- Amount of energy required to remove an e- from another atom
- Period: Increses (closer to octet, atoms are smaller)
- Group: Decreses (Bigger atoms more energy levels)
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Electronegativity
- Ability to attract e-
- Period: Increses (Closer to octet)
- Group: Decreses ( Addition of energy levels)
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Reactivity
- How reactive an e- is
- Left
- Group: Increses (Bigger, easier to remove e-)
- RightPeriod:Increses (Smaller gain e- easier)
- Group: Decreses ( Bigger, harder to gain e-)
- Bump: noble gases do not react
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