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Name an element which is invariably biva...

Name an element which is invariably bivalent and whose oxide is soluble in excess of NaOH and its dipositive ion has a noble gas core.

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To solve the question, we need to identify an element that meets the following criteria: 1. It is invariably bivalent. 2. Its oxide is soluble in excess of NaOH. 3. Its dipositive ion has a noble gas core. ### Step-by-Step Solution: ...
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