Classification of Elements & Periodicity in Properties Test 12

Result

Classification of Elements & Periodicity in Properties Test 12

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Weekly Quiz Competition

Question 1
1 / -0

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

A
Valence principal quantum number (n)

B
Nuclear charge (Z)

C
Nuclear mass

D
Number of core electrons

Solution

Nuclear mass does not affect the valence shell because nucleus consists of protons and neutrons. Whereas proton, i.e. nuclear charge affects the valence shell but neutrons do not. Thus, option (c) is wrong.
Question 2
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Which of the following elements shown as pairs with their atomic numbers belong to the same period?

A
Z = 19 and Z = 38

B
Z = 12 and Z = 17

C
Z = 11 and Z = 21

D
Z = 16 and Z = 35

Solution

Z = 12, 1s², 2s², 2p⁶, 3s² (n = 3)
Z = 17, 1s² 2s² 2p⁶ 3s² 3p⁵ (n = 3)
Question 3
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To which group,an element with atomic number 88 will belong?

A
Group 12

B
Group 17

C
Group 10

D
Group 2

Solution

Z = 88, [Rn] 7s², hence belongs to group 2.
Question 4
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Match the column I with column II and mark the appropriate choice.

A
(A) → (i), (B) → (ii), (C) → (iii), (D) → (iv)

B
(A) → (ii), (B) → (iii), (C) → (iv), (D) → (i)

C
(A) → (iii), (B) → (i), (C) → (iv), (D) → (ii)

D
(A) → (iv), (B) → (iii), (C) → (i), (D) → (ii)

Solution

(A) 3d-transition series, Z = 21 (Sc) to Z=30 (Zn)
(B) Lanthanoid series, Z = 58 (Ce) to Z = 71 (Lu)
(C) Actinoid series, Z = 90 (Th) to Z = 103 (Lr)
(D) 4d-transition Z = 39 (Y) to Z = 48 (Cd) series,
Question 5
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An element has atomic number 79. Predict the group and period in which the element is placed.

A
2^ndgroup, 7^th period

B
11^th group, 6^thperiod

C
13^th group, 6^thperiod

D
12^th group, 6^th period

Solution

Z = 79 [Xe]4f¹⁴5d^10.6s¹ (n = 6)
As n = 6, the element belongs to 6^th period.
Group = ns + (n - I)d, I + 10 = 11