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ppt for group 17
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GROUP 17 ELEMENT ( HALOGEN GROUP)
The Group 17 elements
WHAT IS THE ELEMNTS IN GROUP 17??????
Complete the blank below:
1._ l o _ _ _ _ _
2.C _ _ o _ _ _ _
3._ _ o _ _ _ _
4._ _ _ _ _ e
5._ _ t _ _ _ _ _
Elements :FlourineChlorineBromineIodineAstatine
Non-metalKnown as halogenExist as diatomic molecule in nature (X2)
Elements Atomic Numbers
Electron Arrangement
Fluorine 9
Chlorine 17
Bromine 35
Iodine 53
Astatine 85
PHYSICAL PROPERTIES OF HALOGEN GROUP
2.7
2.8.7
2.8.18.7
2.8.18.18.7
2.8.18.32.18.7
Physical Properties*things that we can see
Atomic numberAtomic radii
Electronegativity
DensityMelting pointBoiling point
PhaseColour
Atomic Number The atomic number can be fined from
periodic table Example:
Down the group, atomic number will increase
Atomic number 17 Cl
Atomic radii or Atomic SizeAtomic radii or Atomic Size Based on atomic number. Example : -F atomic number is 9 so that the
electron configuration is 2:7 . This shows that F has 2 shells.
-I atomic number is 53, the electron configuration is 2:8:18:18:7. This show that I has 5 shells.
-the size of I atom is bigger than F
Down the group the atomic radii or size is increase
. .F
I
Electronegativity
Is the power of outer electron attraction to the nucleus
Decrease going down a group The large atomic number caused the large
size So that the outer most shell is far from the
nucleus. Then the electronegativity is lower
Density All halogens has lower density But density of halogens is increase when
going down the group
Melting and Boiling Point. All halogens has lower melting and boiling
point Because of the lower Van der Waals force
between the molecule. But the melting and boiling point increase
when going down the group. Parallel to the density of each elements.
Phase The phase changes from gaseous to liquid to
solid when going down the group Because the melting and boiling point is
increase.
Every elements has different colours
Pale yellow
Greenish yellow
Deep-red
Bluish blackIodine Iodine
alkaline
metal
water
CHEMICAL PROPERTIES OF HALOGEN GROUPS
Chlorine react with waterChlorine react with water
KNO3 Hydrocholoric
acid 2 cm3 water
Chemical properties:(a) Reaction with water
All the halogens group can dissolve in water to yield acid compound with bleach properties.
Cl2 + H2O HCl + HClO
Br2 + H2O
I2 + H2O
X2 + H2O HX + HOX
HBr + HBrO
HI + HIO
Chemical properties
Bleach propertie
s
(b) Reaction with ironAll the Halogens group react with iron to yield ferum halide in reddish brown colour.
2 Cl2 + 2 Fe 2 FeCl2
2 Br2 + 2 Fe
2 I2 + 2 Fe
HALOGEN + FERUM FERUM HALIDE
2 FeBr2
2 FeI2
(c) Reaction with natrium hidroxideElements Group 17 react with natrium hidroxide to yield salt and water.
Cl2 + 2 NaOH NaCl + NaOCl + H2O
Br2 + 2 NaOH
I2 + 2 NaOH
X2 + 2NaOH NaCl + NaOX + H2O
NaBr + NaOBr H2O+
NaI + NaOI + H2O
Electron valence group 17 :All elements group 17 have 7 electron
valence.When the chemical reaction occur, the
atoms thisgroup accept 1 electron to form anion
halides. (F-,Cl-, Br -, and I-). So that, all the elements
have same chemical properties.
Cl + e Cl -
Example: Chlorine
REACTIVITY OF ELEMENTS GROUP 17 . When down to periodic table: Size of atom will increase Electrons valence situated far from
nucleus atom. So, The nucleus attraction force on to the
electron in electron valence will decreaseF
Cl
Br
ILESS REACTIVE
FFluorine
ClChlorine
BrBromine
IIodine
AtAstatine
LESS REACTIVE
REACTIVITY DOWN REACTIVITY DOWN THE GROUPTHE GROUP
X
PRECAUTIONSPRECAUTIONS
Avoid breathing their vapors.
Gloves and gogle should always be worn when handling this substances.
Handling in fume cupboard.
Obey the laboratory safety rules.
TAKE A BREAK….
1.) Which one of the statements is true about Group 17 elements.
A. In room temperature, Iodine is exist in liquid state.
B. Bromine is more reactive than Chlorine.
C. Chlorine is the most reactive element in Group 17
D. Astatine is radioactive and non-stable.
2.) Which one will not happen when goes down the Group 17.
A. Decreasing in electronegative.
B. Increasing in molecule size.
C. Decreasing in reactivity
D. Decreasing in melting point.
F
Fluorine
Cl
Chlorine
Br
Bromine
I
Iodine
At
Astatine
3.) Which one at the statements below is true about chlorine and bromine elements.
A. They are group 17 members.
B. They are dissolve in tetrachlorometana to form brown solution.
C. They have 1 electron in outer shell.
D. They are gas in room temperature.
SUMMARY
THANK YOU