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Question (1)

QN006962

Mass number of an atom is equal to the sum of —

(A) Electrons and protons
(B) Protons and neutrons
(C) Neutrons and electrons
(D) Electrons only

Correct Answer: B

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Question (2)

QN006963

Mass number is represented by the symbol —

(A) Z
(B) N
(C) A
(D) M

Correct Answer: C

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Question (3)

QN006964

An atom contains 11 protons and 12 neutrons. Its mass number is —

(A) 11
(B) 12
(C) 23
(D) 24

Correct Answer: C

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Question (4)

QN006965

The mass number of an atom can be calculated using the formula —

(A) Protons − neutrons
(B) Electrons + protons
(C) Protons + neutrons
(D) Electrons − neutrons

Correct Answer: C

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Question (5)

QN006966

Which of the following particles contribute to mass number?

(A) Electrons only
(B) Protons only
(C) Protons and neutrons
(D) Electrons and neutrons

Correct Answer: C

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Question (6)

QN006967

An atom has atomic number 15 and mass number 31. Number of neutrons is —

(A) 15
(B) 16
(C) 31
(D) 46

Correct Answer: B

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Question (7)

QN006968

The upper number written in the symbolic representation of an atom indicates the —

(A) Atomic number
(B) Valency
(C) Mass number
(D) Number of electrons

Correct Answer: C

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Question (8)

QN006969

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

(A) 20
(B) 40
(C) 60
(D) 0

Correct Answer: B

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Question (9)

QN006970

Which statement about mass number is correct?

(A) It equals number of electrons
(B) It may be fractional
(C) It equals total nucleons
(D) It is always less than atomic number

Correct Answer: C

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Question (10)

QN006971

If an atom has mass number 27 and atomic number 13, the number of neutrons is —

(A) 13
(B) 14
(C) 27
(D) 40

Correct Answer: B

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Question (1)

Mass number of an atom is equal to the sum of —

Explanation:

Link:

Question (2)

Mass number is represented by the symbol —

Explanation:

Link:

Question (3)

An atom contains 11 protons and 12 neutrons. Its mass number is —

Explanation:

Link:

Question (4)

The mass number of an atom can be calculated using the formula —

Explanation:

Link:

Question (5)

Which of the following particles contribute to mass number?

Explanation:

Link:

Question (6)

An atom has atomic number 15 and mass number 31. Number of neutrons is —

Explanation:

Link:

Question (7)

The upper number written in the symbolic representation of an atom indicates the —

Explanation:

Link:

Question (8)

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

Explanation:

Link:

Question (9)

Which statement about mass number is correct?

Explanation:

Link:

Question (10)

If an atom has mass number 27 and atomic number 13, the number of neutrons is —

Explanation:

Link:

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