Tag: group 17 elements - properties

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

The elements with atomic numbers 9, 17, 35, 53 and 85 belong to noble gases columnz__________.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The atomic number of elements are 9,17,35,53,85.
Electronic configuration of elements will be
9  = 2,7
17= 2,8,7
35= 2,8,18,7
53=2,8,18,18,7
85=2,8,18,18,32,7
The pattern shows that all elements have 7 electron in their outermost valence shell and all these elements belong to halogens.

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

In the third excited state the number of unpaired electrons in chlorine atom is:

  1. 5

  2. 7

  3. 3

  4. 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The general electronic configuration of chlorine is $[Ne] 3s^{2} 3p^{5}$

When electrons are excited in chlorine, the electrons enter into 3d subshell then electronic configuration of chlorine is given as:
$[Ne] 3s^{1} 3p^{3} 3d^{3}$
Thus the number of unpaired electrons will be 7.

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

Which one of the following is the correct order for the bond energies of halogen molecules?

  1. $Cl _2>Br _2>I _2$
  2. $Br _2>Cl _2>l _2$
  3. $l _2>Cl _2>Br _2$
  4. $I _2>Br _2>Cl _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bond energy is inversely proportional to molecular mass as van der wall forces exist  between molecules of halogens
$\therefore$ Bond Energy order:
$Cl _2>Br _2>I _2$

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

The electro valency theory explains that atoms are held together by an attractive force.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrovalency theory (valence band theory) explains two atoms that have an unpaired electron in their orbitals can overlap to give rise to chemical bond and chemical bond nothing but an attractive force between two atoms.

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

Arrange the following atoms in the order of increasing atomic radius.
F, Cl, C, O

  1. F, Cl, O, C

  2. C, O, F,Cl

  3. O, C, F, Cl

  4. F, O, C, Cl
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As we move along a period from left to right, number of proton increases and valence shell remains same, so, radius of atom decreases.
Also, as we move down the group, number of valence shell increases, so, size of atom increases so order of radii is F < O < C < CI.

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

Sea weeds are an important source of :

  1. Iron

  2. Chlorine

  3. Iodine

  4. Bromine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Iodine is a component of almost every living plant and animal. No standard measurements of iodine in food exist because iodine concentrations vary across the world. In general, foods from the sea contain the most iodine, followed by animal foods, then plant foods. Of all foods, seaweed (like kelp), is the most well known and reliable source of natural iodine. Egg and dairy products can also be good sources.

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

Which is the most active element among folllowing?

  1. Chlorine

  2. Oxygen

  3. Sulfur

  4. Fluorine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Most active element is Fluorine. The reduction potential of fluorine is very high. Hence, it is extremely reactive in nature. Also F-F bond energy is low (38 kcal/mol). The valence shell electron configuration of fluorine $2s^22p^5$  indicates that it has very strong tendency to take up one electron to attain stable noble gas configuration. Hence, it has high reactivity.