The Total solution for NCERT class 6-12
Predict the formula of the stable binary compounds thatwould be formed by the combination of the following pairs of elements.
(a) Lithiumandoxygen (b) Magnesium and nitrogen
(c)Aluminium and iodine (d) Silicon and oxygen
(e) Phosphorus and fluorine (f) Element 71 and fluorine
(a) Li2O
(b) Mg3N2
(c) AlI3
(d) SiO2
(e) PF3 orPF5
(f) The element with the atomic number 71 is Lutetium(Lu). It has valency 3. Hence, the formula of the compound is LuF3.