gcse chemistry revision

what does the top number represent in the periodic table?
it represents the mass number
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what does the bottom number represent in the periodic table?
it represents the atomic number
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what are uses of nano particles?
medicines,cosmetics,self cleaning windows(glass coated with titanium oxide)
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properties of giant covalent structures
insoluble in water,allotropes of carbon,high melting/boiling points,lots of energy to overgome forces
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properties of covalent bonding
sharing electrons,does not conduct, no overall charge,non-metals and strong bonds
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properties of simple molecules
weak intermolecular forces,low melting/boiling points
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properties of giant metallic structures->Alloys
Alloys->usually a mixture of metals,harder because of distorted layers,two or more elements(at least one of which is a metal)
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properties of metallic bonding
high melting/boiling points, good conductors, regular layers, atoms closely packed, giant structure, lattice of positively charged ions, delocalised electrons, strong electrostatic charge
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OILRIG
O=OXIDISING, I=IS, L=LOSS OF ELECTRONS.......R=REDUCTION, I=IS, G=GAIN OF ELECTRONS........................OILRIG!
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Card 2

Front

what does the bottom number represent in the periodic table?

Back

it represents the atomic number

Card 3

Front

what are uses of nano particles?

Back

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Card 4

Front

properties of giant covalent structures

Back

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Card 5

Front

properties of covalent bonding

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