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Predict the formula of the stable binary...

Predict the formula of the stable binary compounds that would be formed by the combination of the following pairs of elements.
a.Lithium and oxygen
b. Magnesium and nitrogen
c. Aluminium and iodine
d. Silicon and oxygen
e. Phosphorus and fluorine
f. Element `71` and fluorine

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(a) `Li_(2)O`
(b) ` Mg_(3)N_(2)`
(c) `All_(3)`
(d) `SiO_(2)`
(e) `PF_(3)` or `PF_(5)`
(f) (f) The element with the atomic number 71 is Lutetium (Lu). It has valency 3. Hence, the formula of the compound is `LuF_(3).`
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