Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 21

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Question 1
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$$K$$ has a larger atomic radius than $$Li$$. This confirms:

A
atomic radius decreases down a group.

B
atomic radius increases down a group.

C
atomic radius decreases across a period.

D
atomic radius increases across a period.

Solution

Atomic radius increases down a group. $$K$$ and $$Li$$ are in the same group, and $$K$$ lies below $$Li$$. $$K$$ has a larger atomic radius than $$Li$$. This happens because as we move down the group new shells are added and this increases the distance between the outermost electron and the nucleus.
Question 2
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Which of the following is not a noble gas?

A
Helium

B
Xenon

C
Radium

D
Radon

Solution

Helium, xenon and radon are inert gases. Radium is an alkaline earth metal.
Question 3
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Which of the following elements has the least non-metallic character?

A
Fluorine

B
Chlorine

C
Bromine

D
Iodine

Solution

Non-metallic character increases from left to right in a period and decreases from top to bottom in a group. Thus, order of non-metallic character is F > Cl > Br > I. The least non-metallic character will be in Iodine.
Question 4
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If the two members of a Dobereiner's triad are chlorine and iodine, then the third member of this triad is :

A
fluorine

B
bromine

C
sodium

D
calcium

Solution

According to Dobereiner, the atomic mass of the middle element is nearly equal to the arithmetic mean of the other two. Therefore, the atomic mass of the third element is $$=$$ $$\dfrac{{35.5}+{127}}{2}$$ $$=$$ 81.25, which is the atomic mass of bromine.
Question 5
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Which is not anomalous pair of elements in the Mendeleev's periodic table?

A
$$Ar$$ and $$K$$

B
$$Co$$ and $$Ni$$

C
$$Te$$ and $$I$$

D
$$Al$$ and $$Si$$

Solution

Anomalous pairs are those pairs of elements in which the increasing order of atomic masses was not obeyed. Mendeleev placed these elements according to a similarity in properties and not in the increasing order of their atomic mass.
(A) $$Ar$$ ( at mass = 39.9) is placed before $$K$$ (at mass = 39.1)
(B) $$Co$$ (at mass = 58.9) is placed before $$Ni$$ (at mass = 58.6)
(C) $$Te$$ (at mass = 127.6 ) is placed before $$I$$ (at mass = 126.9).
(D) $$Al$$ and $$Si$$ is not anomalous pair of elements in the Mendeleev's periodic table. $$Al$$ (at mass = 26.98) is placed before $$Si$$ (at mass = 28.4) means $$Al$$ and $$Si$$ are in increasing order of their atomic masses. Therefore they are not Anomalous pair.
Question 6
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The number of valence electrons of cesium is:

A
1

B
2

C
6

D
3

Solution

As the atomic number of cesium is 55, its electronic configuration is 2, 8, 18, 18, 8, 1. This shows that the valence electrons of cesium is 1.
Question 7
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The term atomic radius refers to?

A
Charge of the atom

B
Size of the atom

C
Distance between the centre of nucleus and the first shell

D
Size of the outermost orbital

Solution

The atomic radius refers to the size of an atom. It is the distance between the centre of the nucleus and the outermost shell of an atom. Atomic radius generally decreases on moving left to right across a period and increases down the group.
Question 8
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Mendeleev classified elements in:

A
increasing order of atomic groups.

B
seven periods and eight groups.

C
seven periods and nine groups

D
eight periods and seven groups.

Solution

Mendeleev kept elements in increasing order of atomic weights in seven periods and eight groups.
Therefore, option $$B$$ is correct.
Question 9
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The element with maximum non metallic character is:

A
$$S$$

B
$$P$$

C
$$Cl$$

D
$$Ag$$

Solution

As we move down the group, tendency to lose electron increases and metallic character increases while as we move across a period, electronegativity increases so non-metallic character increases.

So, among these $$Cl$$ have highest non-metallic character.

Hence, option C is correct.
Question 10
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Atomic number of an element is 16. What is the nature of the element?

A
Alkali metal

B
Transition metal

C
Non metal

D
Halogen

Solution

Atomic number 16 have $$2,8,6$$ configuration and so to complete octet it needs two electron thus has tendency to accept electron.
Due to this electron accepting tendency, it is non-metal.

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Periodic Classification of Elements Test - 21

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Periodic Classification of Elements Test - 21

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Question 1

atomic radius decreases down a group.

atomic radius increases down a group.

atomic radius decreases across a period.

atomic radius increases across a period.

Solution

Question 2

Helium

Xenon

Radium

Radon

Solution

Question 3

Fluorine

Chlorine

Bromine

Iodine

Solution

Question 4

fluorine

bromine

sodium

calcium

Solution

Question 5

$$Ar$$ and $$K$$

$$Co$$ and $$Ni$$

$$Te$$ and $$I$$

$$Al$$ and $$Si$$

Solution

Question 6

1

2

6

3

Solution

Question 7

Charge of the atom

Size of the atom

Distance between the centre of nucleus and the first shell

Size of the outermost orbital

Solution

Question 8

increasing order of atomic groups.

seven periods and eight groups.

seven periods and nine groups

eight periods and seven groups.

Solution

Question 9

$$S$$

$$P$$

$$Cl$$

$$Ag$$

Solution

Question 10

Alkali metal

Transition metal

Non metal

Halogen

Solution

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