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Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 183 Marks
Question
How do group 17 elements occur 1
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Answer

Group 17 elements occur mostly in the form of compounds.
  • Fluorine is available as insoluble fluorides in the earth’s crust.
  • The important minerals are fluorspar, $CaF _2$, cryolite, $Na _3 AlF _6$, fluorapatite $3 Ca _3\left( PO _4\right)_2 \cdot CaF _2$.
  • Halides (chloride, bromides, iodides) of Na, K, Mg and Ca are present in sea water.
  • The dried up sea beds contain sodium chloride and the mineral carnallite $\left( KCl . MgCl _2 \cdot 6 H _2 0\right)$.
  • Seaweeds contain up to $0.5 \%$ of iodine. The compound chile saltpetre contains $0.2 \%$of sodium iodate.
  • Astatine is the last member of the halogen family. It is radioactive and has a half life of $8.1$ hours.

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