Historical philosophical, theoretical, and legal foundations of special and i...
Group 17 Elements Physical Properties Reactions
1. Group 17
Made by: Muzammel Ezzat and
Sulaiman Yaqubi
Subject: Chemistry
Teacher: Farid Gul Shinwari
2. Jens
Martensson
• 12.1 Physical properties of Group 17 elements
• 12.2 Reactions of Group 17 elements
• 12.3 Reactions of the halide ions
• 12.4 Disproportionation reactions
Group 17: Halogens
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3. Jens
Martensson
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Group 17 elements
Group 17 occupies the second column from the right in the periodic table
and contains
1) Fluorine (F)
2) Chlorine (Cl)
3) Bromine (Br)
4) Iodine (I)
5) Astatine (At),
6) Tennessine (Ts).
4. Jens
Martensson
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What is group 17 on the periodic table
called?
Elements in group 17 in the periodic table are called the halogens.
1. What are the physical properties of group 17 elements?
• These elements are nonmetallic in nature due to high ionization
enthalpy.
• As molecular weight increases down the group, the density decreases.
• As we move down the group, the melting and boiling point increases.
5. Jens
Martensson
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Reactions of group 17
elements
• The reactivities of the halogens decrease down the group ( At < I <
Br < Cl < F).
• This is due to the fact that atomic radius increases in size with an
increase of electronic energy levels.
• This lessens the attraction for valence electrons of other atoms,
decreasing reactivity
6. Jens
Martensson
What are halide ions
• A halide ion is a halogen atom having a
negative charge.
• The halide anions are fluoride (F−), chloride
(Cl−).
7. Jens
Martensson
Reaction of the halide ions
• With fluoride or chloride ions
Concentrated sulphuric acid isn't strong enough
oxidising agent to oxidise fluoride or chloride ions. In
those cases, all you get produced are the steamy fumes
of the hydrogen halide - hydrogen fluoride or hydrogen
chloride.
8. Jens
Martensson
Disproportionation
• A species is simultaneously reduced and oxidised to
form two different products.
• In general, the term disproportionation reaction can be
applied to any desymmetrisation reaction of the
following type:
2A → A’ + A”,
