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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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Be . It forms bivalent ion which has helium gas core .
`underset(2,2) (Be) to underset(2) (Be^(2+))` (has He gas ore) `+ 2 e^-`
Being slightly acidic , it dissolves in excess of Na OH to form sodium berrylate .
`BeO + 2 NaOH to underset("Sod. berrylate") (Na_(2)BeO_(2)) + H_(2)O`
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