Periodic Properties Test

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Periodic Properties Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

The group and the period number of the chalcogens and the transuranics respectively are:

A
7 and 16

B
6 and 15

C
16 and 7

D
15 and 6

Solution

The oxygen family (group 16) is referred to as chalcogens, which means ore forming because most of the ores occur in nature as oxides or sulphides.
The elements in the period 7 that occur after uranium are artificially prepared and are called transuranics.
Question 2
1 / -0

The magic numbers for the periodicity in properties are:

A
8, 8, 8, 8, 8, 8

B
2, 2, 8, 8, 18, 32

C
2, 8, 8, 18, 18, 32

D
2, 8, 18, 18, 32, 32

Solution

The properties of elements repeat after intervals of 2, 8, 8, 18, 18, 32 in the atomic numbers, because the electronic configuration repeats after these intervals.
Hence, these are regarded as magic numbers.
Question 3
1 / -0

The element with the electronic configuration [Ar] 3d¹⁰, 4s², 4p³ belongs to

A
period VI and group 3

B
period IV and group 15

C
period IV and group 5

D
period VI and group 14

Solution

The valence shell is n = 4. Hence, it belongs to period IV.
The number of valence electrons is 5. Hence, it belongs to group 15.
Question 4
1 / -0

The valence shell configuration of an element belonging to the group of coinage metals is:

A
ns², np⁵

B
(n - 1)d⁹, ns²

C
(n - 1)d¹⁰, ns¹

D
(n - 1)d¹⁰, ns²

Solution

Coinage Metal 'Z' Valence shell configuration

Cu 29 3d¹⁰, 4s¹

Ag 47 4d¹⁰, 5s¹

Au 79 5d¹⁰, 6s¹

A small rearrangement of ns electron to (n - 1)d orbital leads to a stable configuration of fully filled d-orbitals.
Question 5
1 / -0

The periodicity in the properties of elements is a consequence of periodic repetition of the

A
effective nuclear charge

B
electron affinity

C
electronic configuration

D
charge density

Solution

The chemical behaviour of the elements is controlled by the valence shell configuration. Since the electronic configuration of the valence shell repeats after 2, 8, 8, 18, 18 and 32 elements, so do the properties of elements.
Question 6
1 / -0

Which of the following is not correct about the modern periodic table?

A
The elements in a period have the same number of shells.

B
The outer most electron of the elements in a period have the same Azimuthal quantum number.

C
The number of shells occupied increase regularly down a group.

D
The effective nuclear charge increases across the period.

Solution

The Azimuthal quantum number changes across the period.
e.g. l = 0 in the s-block and l = 1 in the p-block.
Question 7
1 / -0

The bridging elements among the following are:

A
Li, Be, B

B
N, O, F

C
Al, Si, C

D
Mg, Al, Si

Solution

The elements of the second period show resemblance with their diagonally opposite neighbours. For example, Li resembles Mg, Be resembles Al and B resembles Si.
The elements of the third period are referred to as bridging elements.

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Coinage Metal	'Z'	Valence shell configuration
Cu	29	3d¹⁰, 4s¹
Ag	47	4d¹⁰, 5s¹
Au	79	5d¹⁰, 6s¹

Periodic Properties Test - 10

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Periodic Properties Test - 10

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Question 1

7 and 16

6 and 15

16 and 7

15 and 6

Solution

Question 2

8, 8, 8, 8, 8, 8

2, 2, 8, 8, 18, 32

2, 8, 8, 18, 18, 32

2, 8, 18, 18, 32, 32

Solution

Question 3

period VI and group 3

period IV and group 15

period IV and group 5

period VI and group 14

Solution

Question 4

ns2, np5

(n - 1)d9, ns2

(n - 1)d10, ns1

(n - 1)d10, ns2

Solution

Question 5

effective nuclear charge

electron affinity

electronic configuration

charge density

Solution

Question 6

The elements in a period have the same number of shells.

The outer most electron of the elements in a period have the same Azimuthal quantum number.

The number of shells occupied increase regularly down a group.

The effective nuclear charge increases across the period.

Solution

Question 7

Li, Be, B

N, O, F

Al, Si, C

Mg, Al, Si

Solution

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ns², np⁵

(n - 1)d⁹, ns²

(n - 1)d¹⁰, ns¹

(n - 1)d¹⁰, ns²