Why Big Fr and Hungry F?

1. Why Helium is the smallest element with the highest IE?
2. Why Noble Gases don't have EN values?
3. Why Francium is the biggest element with the lowest IE and EN?
4. Why Fluorine has the highest EN?

     1.  Francium has the most number of shells and it has the lowest IE and EN because the valence electrons are so far away from the nucleus.

     2.  Helium has the least amount of valence shells and that's why it has the highest EN. 

     3. The noble gases have a full valence shell and don't have the need to gain electrons so they do not have EN.

     4.  Fluorine has the least amount of valence shells so the nucleus is the closest to the other atoms, so more valence electrons are easily gained.

Iodine is element #53

1. Iodine: Iodine, Jod, Yodo.  Name came from the greek word "Iodes" meaning "violet" beacause of its bluish-black color.

2. As a pure element, it looks like a lustrous solid.

3. Iodine has 53 protons and 74 neutrons in its common isotope. Its naturally occuring isotope is 127 with no half-life and the abundance is 100%.  Its average atomic mass is 126.9.

4. There are 53 electrons in its neutral atom. The electron affinity of Iodine is 295.2 kJ mol-1.

5. Its atomic radius is 266.66 x 10-12 m

6. -Melting Point is 236.66 °F

    - Boiling Point is 363.7 °F

7. Its abundance in its body is 4.93 g/cm3. Abundance in Earth's crust 2.690196 ppb by weight. Abundance in the universe is 1 ppb by weight.

8. Some compounds formed by Iodine are: Iodine Pentafluoride (IF5), Idodine Chloride (ICl), and Iodine heptafluoride (IF7)

Iodine Pentafluoride

9. Iodine was discovered by Barnard Courtois in 1811 in France. He isolated iodine from treating seaweed ash with sulphuric acid (H2SO4) while recovering sodium and potassium compounds.

10. Some uses of Iodine are:

      - iodide and thyroxin which contains iodine, are used internally in medicine. It is used as a disinfectant  for external wounds.

      - silver iodide is used in photography
      - deep blue color in a starch solution is used to show a sign of the free element

Iodine Chloride

 

11. Iodine is an important part of the human diet and in fact appears to be the heaviest required element in the diet.

12. http://www.webelements.com/ and http://www.google.com/

Iodine Heptafluoride

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