Group 17,halogen

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

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