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Name the element in each of the followin...

Name the element in each of the following cases:
(i) A bivalent anion of the element having 10 electrons
(ii) A trivalent cation of the element having 10 electrons.
What is the relationship between the two ions called ?

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(i) Oxygen (ii) Aluminium
The two ions are called isoelectronic. `(O^(2-) = 8 + 2 = 10, Al^(3+) = 13 - 3 = 10)`
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