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(a) LiO2 (Lithium dioxide)
(b) Mg3N2 (Magnesium nitrite)
(c) AlI3 (Aluminium triiodide)
(d) SiO2 (Silicon dioxide)
(e) PF3 or PF5 (Phosphorous trifluoride or pentafluoride)
(f) The element with the atomic number 71 is Lutetium (Lu). It has valency 3. Hence, the formula of the compound is LuF3.(Lutetium trifluoride).
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