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Question (31)

QN006742

An atom has 17 protons and 20 neutrons. Its mass number is —

(A) 17
(B) 20
(C) 37
(D) 40

Correct Answer: C

Explanation:

Mass number = protons + neutrons.

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Question (32)

QN006743

An atom has atomic number 26 and mass number 56. Number of neutrons is —

(A) 26
(B) 30
(C) 56
(D) 82

Correct Answer: B

Explanation:

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Question (33)

QN006744

The atomic number of an element equals the number of —

(A) Neutrons
(B) Nucleons
(C) Protons
(D) Shells

Correct Answer: C

Explanation:

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Question (34)

QN006745

An atom contains 20 protons and 21 neutrons. Its mass number is —

(A) 20
(B) 21
(C) 41
(D) 1

Correct Answer: C

Explanation:

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Question (35)

QN006746

The electronic configuration of sodium (Z = 11) is —

(A) 2, 8
(B) 2, 8, 1
(C) 2, 7, 2
(D) 2, 6, 3

Correct Answer: B

Explanation:

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Question (36)

QN006747

The number of valence electrons in chlorine (Z = 17) is —

(A) 5
(B) 6
(C) 7
(D) 8

Correct Answer: C

Explanation:

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Question (37)

QN006748

The valency of oxygen with electronic configuration 2, 6 is —

(A) 1
(B) 2
(C) 4
(D) 6

Correct Answer: B

Explanation:

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Question (38)

QN006749

Carbon has electronic configuration 2, 4. Its valency is —

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: D

Explanation:

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Question (39)

QN006750

The outermost shell of an atom is called —

(A) Nucleus
(B) Valence shell
(C) Stationary shell
(D) Core shell

Correct Answer: B

Explanation:

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Question (40)

QN006751

Atoms with completely filled outermost shells are generally —

(A) Highly reactive
(B) Negatively charged
(C) Stable and unreactive
(D) Radioactive

Correct Answer: C

Explanation:

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