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When this element was discovered, it exhibited luster and malleability, and it reacted very vigorously with water. This element is never found as a free element in nature and always exists in a compound. To which group does this element most likely belong?
a) alkali metals
b) halogens
c) noble gases
d) transition metals
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When this element was discovered, it exhibited luster and malleability, and it reacted very vigorous...
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