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4.1.4 Deduce which ions will be formed when groups 5, 6 and 7 gain electrons IB Chemistry SL

The non-metals in these groups accept electrons until they have the same electronic configuration of the nearest noble gas. These newly formed ions are negative (they have gained electrons which are negative) and now have a full outer shell (just like the noble gases). Ions are normally more stable than atoms -- this is why they form.
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