<span>d. flourine </span> fluorine<span> is the most reactive halogen
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It plays multiple roles, dealing with erosion and deposition
A car speeds up is acceleration
Answer:
niobium and tantalum, oxide and manganese
Explanation:
Both niobium and tantalum are found together in the mineral columbite, a mixed oxide that also contains iron and manganese, and they have similar chemical and physical properties. In fact Niobium was originally named columbium after Columbia, because of its discovery in a mineral sent from America in 1801
