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20 Cards in this Set
- Front
- Back
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what 4 things did mendeleev do
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placed elements in atomic mass order in the periodic table
changed the order of elements in the periodic table where elements didnt fit the propeties of a group eg tellerium and iodine as he didnt know the proton number he left gaps in the periodic table for undiscovered elements he made predictions based on the propeties above and below the element |
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draw the structure of a carbon atom
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what are the charges etc of protons neutrons qnd electrons
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protons + positive charge 1
neutron 0 neutral charge 0 electron - negative charge -1 |
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what is an isotope
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an isotope is atoms of the same elements that have a different number of neutrons in the nucleus
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what is the ram of bromine bromine 77(51%) bromine 83 (49%)
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what do periods tell you
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how many electron shells there are around an element eg sodium is in period 3 so has 3 shells. they contain elements whose propeties gradually change
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what are the chemical forms of potassium, phosphorus and silver
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k
p ag |
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describe copper, magnesium and argon
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copper - its in the transition metals block and in period 4 - Cu
magnesium - its in group 2 earth alkaline metals and is in period 3 - Mg argon - is in group 8/10 the noble gases(inert gases) and in period 3 - Ar |
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what is electron configuration
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is the arrangement of the electrons in the shells of each element
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what is theelectron configuration of lithium, sulphur and chlorine
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what is ionic bonding
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bonding between a metal and non metal
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show ionic bonding with sodium and chlorine
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what is the answer to ca2+ and br-
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CaBr2
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what are the structures of graphite and diamond
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what is the number of covalent bonds each carbon atom forms in graphite and diamond
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graphite 3
diamond 4 |
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what is the melting points of diamond and graphite
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both very high as lots of strong covalent bonds have to be broken
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what is the hardness of graphite
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soft and slippery so layers of atoms can slide over each other
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what is the hardness of diamond
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very hard as the atoms are bonded together in a rigid network
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what is theelectrical and thermal conductivity of graphite
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conducts heat and electricity as some electrons are free to move
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what is the electrical and thermal conductivity of diamond
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does not conduct heat and electricity as no electrons are free to move
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