(electronic configuration) electrons move around the nucleus in a series of levels known as shells
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what makes up period 1?
hydrogen and helium
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what is the same for each group?
elements In the same group have the same number of electrons in their outer shell, and is shown by their group number
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what does period number give?
the number of occupied shells
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what do all the elements in group 1 do?
react vigorously with water to from hydrogens and hydroxides eg potassium hydroxide
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what do all the elements in group 7 do?
react with hydrogen to form compounds with similar formulae eg hydrogen fluoride
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what do all the elements in group 2 do?
form chlorides with similar formula eg MgCI2, CaCI2
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why is group 0 known as the noble gases?
they are almost completely un-reactive because their outer most shell is full, so they don't need to lose, gain or share electrons in a chemical reaction
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where are the metals located ?
on the left side of the periodic table
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where are the non metals located?
on the right side of the periodic table
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why is hydrogen not in group 1?
because it does not share the same chemical properties, and is not a metal
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properties of metals
conduct heat + electricity, solids with high bpt + mpt, shiny, malleable, ductile,form ionic compounds, form positive ions In their compounds
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properties of non metals
tend to have low bpt + mpt, brittle when solids, dull, don't usually conduct electricity (graphite), poor conductors of heat, form both ionic and covalent compounds, tend to form negative ions in ionic compounds
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what do metals generally form?
basic oxide + acid -> salt + water
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what do non metals generally form?
acidic oxide + bases/alkali -> carbonate + water
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what happens when a basic oxide is soluble In water?
it will dissolve to become an alkali
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what happens when an acidic oxide is soluble in water?
it will dissolve to become form an acidic solution
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