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19 Cards in this Set
- Front
- Back
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Who published the first table of elements and when? |
John Dalton in 1808 |
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Who improved the first table of elements and when? |
John Newlands in 1864 |
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What did John Newlands do to the table elements? |
Organised the elements by mass and noticed the properties of every 8th element seemed similar. (Law of Octaves) |
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Which russian chemist cracked the problem to give the periodic table and when? |
Dmitri Mendeleev in 1869 |
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What did Mendeleev do to give us the modern periodic table. |
He placed them in order of their atomic weights so a periodic pattern in their properties could be seen. He also left gaps for new elements. |
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True: Do all elemtens fit in Mendeleev's pattern. |
False e.g argon |
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Why was the law of Octaves refused? |
Because there were exceptions |
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What does periodic mean! |
The properties that repeat at certain intervals. |
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What determines an elements position in the periodic table? |
It's atomic number |
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What determines an atoms chemical properties? |
The number of electrons on the outer shell. |
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What does the group number represent? |
The number of electrons on the outer shell. |
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What is the name of group 8 and why are they unreactive? |
The noble gases because they have a full outer shell of electrons. |
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What is the name of group 1 and what are they? |
Alkali Metals ~ reactive metals |
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What are the transition metals? |
They are unreactive metals |
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Why are alkali metals stores under oil? |
Because they react with oxygen. |
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True or false: group 1 metals have high boiling points. |
False ~ they have low boiling points (weak bonds) |
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True or false: group 1 metals have low densities. |
True ~ They float in water |
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What is group 7 and what determines their reactivity? |
The halogens are toxic non-metals that determine their reactivity by their electronic structure. |
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What can a more reactive halogen displace? |
A less reactive halogen. |
