PROPERTIES OF GROUP 17 ELEMENTS

Physical Properties of halogens

1. Are poisonous
2. Brittle and crumbly in their solid form
3. Do not conduct electricity
4. Form diatomic molecules (containing two atoms). For example Fl2.
5. Form colored vapors.

 Chemical Properties of halogens

1. The halogens are among the most reactive elements in the Periodic Table.
2. They all have seven valence electrons – seven electrons in their outer-shell.
3. They react with metals to form compounds called halides.

Reactivity increases as you go up Group 17

When halogens react with metals, the halogen atoms gain an electron. The smaller the atom the easier it is to attract the electron and the more reactive the element. (This is opposite of the trend in Group 1 where the larger the atom the easier it is to lose an electron.)

LET'S DISCOVER THE REACTIVITY OF GROUP 17 ELEMENTS

1. In nature, all halogens exist as diatomic molecules. They are written as F₂, Cl₂, Br₂, I₂ and As₂.
2. Most of the halogens exist in the nature as halide salts.
3. Halide is the name given to the ion of halogens. Table below shows the corresponding halide of the halogen.

Halogen	Halide
Fluorine	Fluoride
Chlorine	CHloride
Bromine	Bromide
Iodine	Iodide

NOW, let's discover how group 17 elements react. DON'T forget to relate with the atomic mass and electron arrangement of each elements to compare the reactivity between group 17 elements... HAPPY WATCHING!!!!

HALOGENS

HI ALL...

GROUP 17 ELEMENTS ARE ALSO KNOWN AS HALOGENS. GROUP 17 ELEMENTS ARE POISONOUS. 

IN GENERAL, HALOGENS HAVE LOW MELTING AND BOILING POINTS BECAUSE THEIR MOLECULES ARE ATTRACTED TO EACH OTHER BY WEAK FORCES. 

WHEN GOING DOWN THE GROUP, THE PHYSICAL STATE OF HALOGENS AT ROOM TEMPERATURE CHANGES FROM GAS TO LIQUID THEN TO SOLID. 

FLOURINE IS A PALE YELLOW GAS

CHLORINE IS A GREENISH YELLOW GAS

BROMINE IS A REDDISH BROWN LIQUID

IODINE IS A PURPLISH BLACK SOLID

DO YOU NOTICE THAT THE COLOUR OF HALOGENS ALSO BECOMES DARKER WHEN GOING DOWN GROUP 17?

WHY IS THIS SO?????

Learn more of PROPERTIES OF GROUP 17 ELEMENTS  by clicking to this CHEMWIKI

SCIENTISTS BEHIND THE DEVELOPMENT OF PERIODIC TABLE

Hi all.  

We know what the periodic table looks like, but where did it come from? Whose idea was it to arrange the elements this way? 

Here's are all scientist who contributes to the development of periodic table... happy reading,students!!!!!!

read more through this link :   SCIENCE LEARNING

PROJECT BASED LEARNING TASK

ELEMENT BROCHURE

You are to make an attractive eye catching brochure on a regular sized 8 ½” x 11” paper. The brochure must be tri-fold or bi-fold and must look like something you would like to read if you just happened to see it laying around. Research the element you were assigned. This brochure must include the following information:

1. Name of element and how it got its name. 

2. Symbol, Atomic Number and Atomic Mass 

3. Where it’s found and in what form (compound). 

4. Physical facts: 

a. Melting point 

b. Boiling point 

c. Density 

d. Abundance in the earth’s crust 

5. Uses 

6. Source(s) of your information

Element Choices:
 

Hydrogen Boron Fluorine Aluminum Chlorine Platinum Arsenic

Helium Carbon Neon Silicon Silver Lead Krypton

Lithium Nitrogen Sodium Phosphorus Mercury Nickel Tin

Berilium Oxygen Magnesium Sulfur Gold Copper Chromium

Example for Gold    
  Front:
 
 Back:
YOU CAN PRESENT YOUR BROCHURE TO THE CLASS.... 

QUIZZES

HI....

Now,after you have learnt about the Group 1 elements which also known as H>A>L>O>G>E>N, why not test yourself with this short quizzes.. time allocates for this activity is 20 minutes!!!!!

PAPER 3 HOTS QUESTION

HI ALL...

Here is one of the paper 3 SPM Chemistry question from chapter PERIODIC TABLE... 

lets try to do this question. You can refer to any reference book or you can access to internet to complete your task.. sample answers will come very soon... GOOD LUCK!!!!!