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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties3 Marks
Question
Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements.
  1. Lithium and oxygen.
  2. Magnesium and nitrogen.
  3. Aluminium and iodine.
  4. Silicon and oxygen.
  5. Phosphorus and fluorine.
  6. Element 71 and fluorine.
✓

Answer

a. $\mathrm{Li}_2 \mathrm{O}$
b. $\mathrm{Mg}_3 \mathrm{~N}_2$
c. $\mathrm{All}_3$
d. $\mathrm{SiO}_2$
e. $\mathrm{PF}_3$ or $\mathrm{PF}_5$
f. The element with the atomic number 71 is Lutetium (Lu). It has valency 3 . Hence, the formula of the compound is $\mathrm{LuF}_3$.

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