relative mass of isotope x relative abundance + relative mass of isotope x relative abundance / relative abundance + relative abundance = relative atomic mass
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What two groups are metals and lose electrons to form +ve ions or cations?
Groups 1 and 2
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What two groups are non-metals and gain electrons to form -ve ions or cations?
Groups 6 and 7
3 of 12
How many bonds does a diamond form?
4 covalent bonds
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How many bonds does graphite form?
3 covalent bonds
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How do you calculate the Rf value?
Rf = distance travelled by substance/distance travelled by solvent
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What is covalent bonding?
Sharing a pair of Electrons
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What is Ionic bonding?
The transfer of Electrons, they either lose or gain Electrons
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What are the properties of Alkali Metals (in group 1)?
They are soft and have Low melting points and they react vigorously in water
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What are the properties of Halogens (in group 7)?
All have 7 electrons in their outer shell, react with metals to form metal halides, react with hydrogen to make hydrogen halides
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What are the properties of Noble Gases (in group 0)
They're all colourless gases, the boiling points and densities increase as you go down the group
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Flame test: What colour flame does: sodium,potassium,calcium and copper produce?
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