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Identify the element (X) in each of the ...

Identify the element (X) in each of the following
(i) The reaction between metallic element(X) and water is quite slow.
(ii) (X) is a reactive metal which forms three ionic oxides with composition. `X_(2)O,XO_(2) and X_(2)O_(2)` the perchlorate `XClO_(4)` is insoluble in water.
(iii) (X) is the most abundant element in group 1.
(iv) the chemistry of (X) resembles that of magnesium.

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