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| simple form of matter CANT BE BROKEN DoWn(atoms) |
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| 2 or more elements chemically combined (molecules) |
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| when substances is changed by physical properties but still the same |
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| when the chemical compostion has been attend for a NEW SUBSTANCE |
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| thought atom smallest particle came up with atomic theory! |
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| cathode ray tube experiment proved atom neg. charged particle(electrons)also plum pudding model |
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gold foil experiment
FOUND NUCLEAUS |
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1+
in nucleus
size abt the same |
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-1
outside nucleaus
smallest of 3 1/800 |
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0
in nucleus
abt the same |
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| electrons traveling around nucleus on paths ENERGY levels |
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| 1st person credited for periodic table left gaps on chart thought more would be discovered |
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arranged in columns=Groups (Families)
ROws=periods |
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1st column on far left
all have 1ve
they lose one electron
most reactive of all metals
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| atom wothan overall charge |
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2nd column on left
all lose 2 electrons
2nd most reactive |
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next to last column on right all have -1ve
gain 1 eletron most reactive of non metals |
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column on right(group 8)
last energy is full
UNREACTIVE because they are full |
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| same element different mass |
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left of staircase
electro loses
usually solid in room temp
good conductors of heat and electricity
shiny when polished
flexible |
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right of staircase
electron gainers
low melting point most gases at room temp
poor conductors of heat and electricity
solids are dull inapperance
fragile solids |
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contains hydrogen
produces ion in water (h30)
taste sour
conducts electricity in water
reacts with metals producing hydrogen gas
poisonous and corrosive
litmus paper turns red
phenolphthslein stays colorless
ph below 7
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Definition
contains hydroxide
produces OH
tastebitter
conducts electicity
slippery
poisonous and corrosive
lithmus paper turns blue
phenolphalen turns pink
ph above 7 |
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| are one of two byproducts of an acid and base |
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| are chemicals that test for presence of acids or base |
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