Atomic Structures Test

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Atomic Structures Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

If the speed of an electron in the Bohr's first orbit of hydrogen is X, then the speed of electron in 4^th orbit is

A
X/8

B
X/6

C
X/4

D
X/2

Solution

Speed of electron in n^th orbit = speed of electron in first orbit/n

Speed of electron in 4^th orbit = X/4
Question 2
1 / -0

Which of the following sets of quantum numbers is correct for an electron in a 4f orbital?

A
n = 4, I = 3, m = 4, s = 1/2

B
n = 4, I = 4, m = 0, s = 1/2

C
n = 4, I = 2, m = -1, s = 1/2

D
n = 4, I = 3, m = -2, s = 1/2

Solution

The following set of quantum numbers is possible for an electron in a 4f orbital:

n = 4

l = 3

m = -3, -2, -1, 0, 1, 2, 3

s = +1/2 or -1/2

Hence, option (4) is correct.
Question 3
1 / -0

Which of the following sets of quantum numbers is not allowed?

A
n = 2, l = 0, m = + 1

B
n = 2, l = 1, m = + 1

C
n = 2, l = 0, m = 0

D
n = 2, l = 1, m = 1

Solution

m > l is not allowed.
Question 4
1 / -0

A transition metal X forms a X⁺² ion, which has a configuration [Ar] 3d⁵. What is its atomic number?

A
25

B
26

C
22

D
19

Solution

The number of electrons in transition element X is 18 (1s² 2s² 2p⁶ 3s² 3p⁶) + 5(3d⁵) + 2(electrons lost) = 25.

Therefore, the atomic number of X = 25

The element is Mn (Manganese).

Mn⁺² is highly stable due to its half-filled d-orbitals.
Question 5
1 / -0

The general outer electronic configuration of d block elements is

A
(n - 1)d^1-10ns²

B
(n - 1)d¹⁰ns^1-2

C
(n - 1)d^1-10ns^1-2

D
(n - 1)d^0-10ns^1-2

Solution

The general outer electronic configuration of d block elements is (n - 1)d^1-10ns^1-2.

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Atomic Structures Test - 3

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Atomic Structures Test - 3

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Question 1

X/8

X/6

X/4

X/2

Solution

Question 2

n = 4, I = 3, m = 4, s = 1/2

n = 4, I = 4, m = 0, s = 1/2

n = 4, I = 2, m = -1, s = 1/2

n = 4, I = 3, m = -2, s = 1/2

Solution

Question 3

n = 2, l = 0, m = + 1

n = 2, l = 1, m = + 1

n = 2, l = 0, m = 0

n = 2, l = 1, m = 1

Solution

Question 4

25

26

22

19

Solution

Question 5

(n - 1)d1-10ns2

(n - 1)d10ns1-2

(n - 1)d1-10ns1-2

(n - 1)d0-10ns1-2

Solution

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(n - 1)d^1-10ns²

(n - 1)d¹⁰ns^1-2

(n - 1)d^1-10ns^1-2

(n - 1)d^0-10ns^1-2