positively charged, almost whole mass of atom concentrated in the nucleus
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atomic number
tells us how many protons there are. on the bottom
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mass number
total number of protons and neutron in the atom .
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elements
consist of atoms with the same atomic number
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isotopes
are different forms of the same element which have different number of neutrons
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compounds
when elements react atoms combine with other atoms to from compounds
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mixtures
there's no chemical bonds between different parts of the mixture
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group 1 elements
are reactive, soft metals
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alkali metals
form ionic compounds with non-metals
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halogens
can form molecular compounds, and can form ionic bonds with metals, more reactive halogens will displace less reactive halogoens
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group 0
are all inert, colourless gases
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ionic compounds
have a regular lattice structure, they all have similar properties
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covalent bonding
this is sharing electrons
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polymers
are long chains of repeating units
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giant covalent structures
are macromolecules
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allotrope are carbon
diamonds is very hard; graphite contains sheets of hexagons; graphene is one layer of graphite; fullerenes from spheres & tubes
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metallic bonding
involves delocalised electrons
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titration
used to find out concentrations
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displacement reactions
they are redox reactions, it involves kicking another one out of a compound, the RULE- a more reactive metal will displace a less reactive metal metal from it compounds
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electrolysis
means the splitting up with electricity
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exothermic reaction
heat is given out, reaction which transfers energy to the surroundings usually by heating this is show by a rise in temperature
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endothermic reaction
heat is taken in, is one which takes in energy from the surroundings this is shown by a fall in temperature.
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fuel cells
is a electrical cell that's supplies with a fuel & oxygen & uses energy from the reaction between them to produce electrical energy efficiently
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hydrogen-oxygen fuel cells
involve a redox reaction, could be used in vehicles
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Other cards in this set
Card 2
Front
tells us how many protons there are. on the bottom
Back
atomic number
Card 3
Front
total number of protons and neutron in the atom .
Back
Card 4
Front
consist of atoms with the same atomic number
Back
Card 5
Front
are different forms of the same element which have different number of neutrons
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