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The elements in the group 7a are called halogens. The outer shells of these elements, or the valence shells consist usually of five p electrons and two s electrons. Therefore, they need only one electron to complete the p electron energy level and become stable. Therefore, when they form ions, they usually gain one electron and have the charge of -1.
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Element x is found in group 2A and element Y in group 5A how many electrons are transferred when these elements form a compound
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If x electrons are needed to displace 108g silver from a solutions which contains Ag+ ions, how many electrons are needed to displace 9g of aluminium from a solutions which contain Al3+ ions?
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