Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The element with the highest electron affinity is

A
N

B
H

C
He

D
F

Solution

Electron affinity is defined as the change in energy (in kJ/mole) of a neutral atom (in the gaseous phase) when an electron is added to the atom to form a negative ion. Halogens have the greatest electron affinity as by gaining one electron, they attain noble gas configuration. Thus, among the given elements, fluorine has the highest electron affinity.
Question 2
1 / -0

With respect to chlorine, hydrogen will be

A
electronegative

B
neutral

C
electropositive

D
None of the above

Solution

Chlorine is more electronegative and in an H-Cl bond, the shared pair of electrons are drifted more towards the Cl atom. Hydrogen is relatively electropositive.
Question 3
1 / -0

Electronegativity refers to the tendency of an atom to

A
lose electrons

B
repel electrons

C
share electrons with the other atoms

D
attract bonding electrons

Solution

Electronegativity refers to the tendency of an atom to attract bonding electrons.
Question 4
1 / -0

Which of the following oxides forms the strongest base?

A
MgO

B
Al₂O₃

C
Na₂O

D
CaO

Solution

From the given oxides, Na₂O forms the strongest base.
Question 5
1 / -0

Which of the following is a metalloid?

A
Magnesium

B
Gallium

C
Germanium

D
Vanadium

Solution

A metalloid is a chemical element with properties intermediate between those of typical metals and nonmetals. The elements boron, silicon, germanium, arsenic, antimony, tellurium and polonium are metalloids.
Question 6
1 / -0

Which of the following elements has 4 electrons in its outermost shell?

A
Beryllium

B
Silicon

C
Sulphur

D
Magnesium

Solution

Silicon belongs to carbon family. Thus, it has 4 electrons in its valence shell.
Question 7
1 / -0

Which of the following elements has zero electron affinity in the 3^rd period of the periodic table?

A
Argon

B
Phosphorus

C
Aluminium

D
Sulphur

Solution

The electron affinity value of noble gases are zero because of the stable electronic configuration of ns²np⁶ which has no tendency to take in additional electron. No energy is released and their electron affinities are zero.
Question 8
1 / -0

Which of the following factors is inversely related to the metallic character of an element?

A
Reducing power

B
Atomic size

C
Electronegativity

D
None of these

Solution

Electronegativity is a chemical property that describes the tendency of an atom or a functional group to attract electrons towards itself. Non-metallic elements have a strong tendency to gain electrons. Therefore, electronegativity is directly related to the non-metallic character of elements.

We can also say that electronegativity is inversely related to the metallic character of elements. Thus, the increase in electronegativity across a period is accompanied by an increase in non-metallic character (or a decrease in metallic character) of elements.

Similarly, the decrease in electronegativity down a group is accompanied by a decrease in non-metallic character (or an increase in metallic character) of elements.
Question 9
1 / -0

The element which accepts electrons rarely to form anion belongs to

A
0 group and 3^rd period

B
VI A group and 3^rd period

C
VII A group and 2^nd period

D
VIII A group and 3^rd period

Solution

The element which accepts electrons rarely to form anion belongs to VIII A group and 3^rd period.
Question 10
1 / -0

The electronic configuration of chromium (Z = 24) is

A
1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁴, 4s²

B
1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵, 4s¹

C
1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁶, 4s⁰

D
1s², 2s², 2p⁶, 3s², 3p⁶, 3d³, 4s³

Solution

The electronic configuration of chromium (Z = 24) is 1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵, 4s¹.

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Periodic Classification of Elements Test - 4

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Periodic Classification of Elements Test - 4

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Question 1

N

H

He

F

Solution

Question 2

electronegative

neutral

electropositive

None of the above

Solution

Question 3

lose electrons

repel electrons

share electrons with the other atoms

attract bonding electrons

Solution

Question 4

MgO

Al2O3

Na2O

CaO

Solution

Question 5

Magnesium

Gallium

Germanium

Vanadium

Solution

Question 6

Beryllium

Silicon

Sulphur

Magnesium

Solution

Question 7

Argon

Phosphorus

Aluminium

Sulphur

Solution

Question 8

Reducing power

Atomic size

Electronegativity

None of these

Solution

Question 9

0 group and 3rd period

VI A group and 3rd period

VII A group and 2nd period

VIII A group and 3rd period

Solution

Question 10

1s2, 2s2, 2p6, 3s2, 3p6, 3d4, 4s2

1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s1

1s2, 2s2, 2p6, 3s2, 3p6, 3d6, 4s0

1s2, 2s2, 2p6, 3s2, 3p6, 3d3, 4s3

Solution

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Al₂O₃

Na₂O

0 group and 3^rd period

VI A group and 3^rd period

VII A group and 2^nd period

VIII A group and 3^rd period

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁴, 4s²

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵, 4s¹

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁶, 4s⁰

1s², 2s², 2p⁶, 3s², 3p⁶, 3d³, 4s³