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ATOMIC STRUCTURE (Elements, compounds and mixtures (elements are found in…
ATOMIC STRUCTURE
Elements, compounds and mixtures
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Fractional distillation
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You heat the mixture and the one with the lowest boiling point evaporates first and condenses in the fractionating column until the boiling point is reached and then it is collected as it passes through the condensing tube. then, the second liquid is collected when its boiling point is reached.
Chromatography
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Draw a pencil line, put the dots of ink on the line and put the bottom of the paper into a solvent and they will be carried up the paper as the solvent goes up the paper.
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Development of table
Was first put in ascending order of atomic mass, but was not accepted as it was not true for al elements and he didn't leave gaps
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Metals
Every metal conducts electricity. This is due to the metallic bonding found within metal elements. In metallic bonding, the outer electrons are delocalised (free to move). This produces an electrostatic force of attraction between the positively charged metal ions, and the negatively charged delocalised electrons.
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Simple distillation
used to separate a liquid from a solid, where we need to keep the liquid
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Relative atomic mass
Isotopes = atoms of the same element with different numbers of neutrons. so the RAM is the average of the mass numbers
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Transition elements
good conductors of heat and electricity , dense and strong and shiny, less reactive than group 1, denser and stronger than alkali metals, have higher melting points than alkali metals
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