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- 1why is aluminium positioned in group 3 of the periodic table?It has 3 electrons in its outer shell.
(electronic structure=2,8,3)
-group 3 elements have 3 electrons in their outer shell. - 2Sub atomic particles.atomic no- smallest no.(protons; there are the same number of electrons as protons, E.G: 2 electrons,2protons)
mass no- biggest no.( protons and neutrons)
neutrons- mass no- no of protons. - 3why are noble gases unreactive?Noble gases have a full outer shell, apart from helium which has 2 electrons in its outer shell.
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- Flashcards on Untitled, created by Charley Durbin on 21/02/2018.
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- Charley Durbin
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