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Question (21)

QN007032

The electronic configuration of oxygen (atomic number 8) is —

(A) 2, 6
(B) 6, 2
(C) 2, 8
(D) 4, 4

Correct Answer: A

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Question (22)

QN007033

Which shell has the highest energy among K, L, M and N?

(A) K
(B) L
(C) M
(D) N

Correct Answer: D

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Question (23)

QN007034

The electronic configuration 2, 8, 8 corresponds to an atom with atomic number —

(A) 10
(B) 16
(C) 18
(D) 20

Correct Answer: C

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Question (24)

QN007035

The formula 2n² gives the —

(A) Atomic mass
(B) Maximum electrons in a shell
(C) Number of neutrons
(D) Valency

Correct Answer: B

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Question (25)

QN007036

An atom has 13 electrons. Its electronic configuration is —

(A) 2, 8, 3
(B) 2, 3, 8
(C) 8, 2, 3
(D) 2, 6, 5

Correct Answer: A

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Question (26)

QN007037

The shell farthest from the nucleus among K, L, M and N is —

(A) K
(B) L
(C) M
(D) N

Correct Answer: D

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Question (27)

QN007038

Which of the following atoms has completely filled K and L shells?

(A) 2, 6
(B) 2, 8
(C) 2, 8, 1
(D) 2, 7

Correct Answer: B

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Question (28)

QN007039

The number of electrons in the valence shell of sodium (2, 8, 1) is —

(A) 1
(B) 2
(C) 8
(D) 11

Correct Answer: A

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Question (29)

QN007040

Which shell can have a maximum of 8 electrons?

(A) K only
(B) L only
(C) M only
(D) N only

Correct Answer: B

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Question (30)

QN007041

The electronic configuration of neon is —

(A) 2, 6
(B) 2, 8
(C) 2, 8, 2
(D) 8, 2

Correct Answer: B

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