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Question (21)

QN006982

If the mass number is 39 and the atomic number is 19, the number of neutrons is —

(A) 19
(B) 20
(C) 39
(D) 58

Correct Answer: B

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Question (22)

QN006983

Which of the following determines the approximate mass of an atom?

(A) Electrons only
(B) Protons and neutrons
(C) Electrons and shells
(D) Atomic radius

Correct Answer: B

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Question (23)

QN006984

The notation ²³₁₁Na indicates a mass number of —

(A) 11
(B) 12
(C) 23
(D) 34

Correct Answer: C

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Question (24)

QN006985

An atom has mass number 24 and 12 neutrons. The atomic number is —

(A) 10
(B) 12
(C) 24
(D) 36

Correct Answer: B

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Question (25)

QN006986

Which quantity remains different in isotopes of an element?

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

Correct Answer: C

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Question (26)

QN006987

An atom has 14 protons and 14 neutrons. Its mass number is —

(A) 14
(B) 28
(C) 0
(D) 7

Correct Answer: B

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Question (27)

QN006988

Which of the following particles has negligible contribution to mass number?

(A) Proton
(B) Neutron
(C) Electron
(D) Nucleon

Correct Answer: C

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Question (28)

QN006989

An atom represented as ³¹₁₅P contains how many nucleons?

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

Correct Answer: C

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Question (29)

QN006990

If an atom contains 8 protons and 10 neutrons, its mass number is —

(A) 8
(B) 10
(C) 18
(D) 2

Correct Answer: C

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Question (30)

QN006991

The mass number helps determine the total number of —

(A) Electrons
(B) Shells
(C) Nucleons
(D) Valence electrons

Correct Answer: C

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