Tag: group 17 elements - general properties

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Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

Which of the following is correct?

  1. Iodine is solid

  2. Chlorine is insoluble in water.

  3. Iodine is more reactive than bromine.

  4. Bromine is more reactive than chlorine.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reason is that the attractive forces between the molecules of these elements increase from top to bottom of the Group.

In iodine, the electrons are so far from the nuclei that the electron clouds can easily distort. The London dispersion forces are strong. So the Iodine is solid.

Hence option A is correct.

Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

Have you ever noticed the fact that two siblings can have different personalities? Even though two people may be members of the same family, it does mean that they will behave in similar ways.
The same thing can be said about elements in a group ("family") on the periodic table. For example, fluorine and iodine are members of the halogen family, but their physical properties are different, as shown in the table below.

Element Melting Point $(^{\circ}C)$ Boiling Point $(^{\circ}C)$
Fluorine $-220$ $-188$
Iodine $+118$ $+184$

Which of the following is the BEST explanation for these differences in melting and boiling point?

  1. Fluorine has a higher value for electronegativity than iodine.

  2. The covalent bond in the fluorine molecule is stronger than the covalent bond in the iodine molecule.

  3. Iodine molecules are larger and more polarizable than fluorine molecules.

  4. Fluorine is a nonpolar molecule, but iodine is a polar molecule.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As we move down the group of halogens the size of elements increases thereby increasing the Van der Waal forces; hence boiling and melting point of Iodine is more than Fluorine molecule.