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38 Cards in this Set
- Front
- Back
What is the atomic number |
the number of protons |
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isotopes |
differnt forms of the same element |
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what is atomic mass |
the average of all of the differnt masses of a perticular elemeent |
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who were the six people that we studid when we learned about this history of the atomic model in order
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democratis, John dalton, jj thimson,rjtherford,bohr,Chadwick
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What is the maximum orbit of: 1st orbit 2nd orbit 3rd orbit
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2, 8, 18 |
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Explian why ecah element can be indentfied by a specidic color or bands of color |
Every element has its own specific line spectrum |
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Catoin |
positive ion |
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Anion |
negative ion |
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What did Mendeleev do? |
Russian Chemist 1863 Organized delemnts in rows by increasing atomic masses the grouped elemts together with similar characterisics in the same colum -left empty spaces |
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Henry Moseley |
English phisysit changed meendelev by atomic number |
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perodic law |
repeating chemical and physical property of elements chnge periodically with the atomic number of elements |
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DEmotrius |
-World was made up of invisbale units called atoms -atoms= undividable -O
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John Dalton |
-atom look like a solid round sphere -wrote 1s atomic theory -every element was made up of tiny particles called atoms -atoms of same element are eact same -atoms can be bonded together to form a molecule |
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JJ Thomson |
*discovered electrons -discovered atoms have positive and negative charges -Postive materuals with negative stuff stuck inside -plum pudding model |
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Ernest Rutherford |
-gold foil experiment -found nuclues (proton) -atoms were mostly empty space Rutherford experiment |
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Neils Bohr |
-electrons orbit around the nucleus in set paths -planetary model |
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James Chadwhick |
-Discovered Nuetron -Nuetron doesnt't affect the charge |
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WHat does metals valance do |
lose valance electrons |
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where are metals located |
to the left of the stair step line |
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Metals are good conductors of.. |
heat and electricty |
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what are metals at room temperature |
solid |
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what is the execption |
mercury |
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Luster |
shines or reflects light |
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Nonmetals tend to valance |
gain valance elctrons |
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where are non metals found |
right of the stair step line expect hydrogen |
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What metilloids nickname |
semi conductors |
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where are the noble gasses found on the periodic table |
column 18 - far right |
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where can you find transition metals |
3-12 - middle |
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what is the atomic number |
thhe number of protons |
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How did Meendelv group elements in his version of the periodic table |
In rows according to increasing atomic mass |
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noble gas |
unreactive elemets found to the very right of the periodic table |
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period |
rows -> atomic number |
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Group |
columns -> valance |
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where are tranisition metals found on the periodic table |
in the middle of the periodic table |
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what is the only non metal that is liquid at room tempterature |
mercury |
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what is an element |
a substance made up of only one type of atom |
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atomic number |
number of protons |
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atomic mass |
number of protons+ neutrons |