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Question (31)

QN006842

The mass number of an atom can never be —

(A) A whole number
(B) Equal to atomic number
(C) Smaller than atomic number
(D) Greater than atomic number

Correct Answer: C

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Question (32)

QN006843

An atom has 20 neutrons and mass number 39. Its atomic number is —

(A) 19
(B) 20
(C) 39
(D) 59

Correct Answer: A

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Question (33)

QN006844

The total number of nucleons in an atom equals its —

(A) Atomic number
(B) Mass number
(C) Valency
(D) Electronic configuration

Correct Answer: B

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Question (34)

QN006845

Which subatomic particle determines the identity of an element?

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

Correct Answer: C

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Question (35)

QN006846

A chlorine atom has 17 protons and 18 neutrons. Its mass number is —

(A) 17
(B) 18
(C) 35
(D) 1

Correct Answer: C

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Question (36)

QN006847

If a neutral atom contains 15 electrons, the number of protons is —

(A) 0
(B) 15
(C) 30
(D) 45

Correct Answer: B

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Question (37)

QN006848

Which of the following is a correct representation of aluminium atom?

(A) ¹³₂₇Al
(B) ²⁷₁₃Al
(C) ⁴⁰₁₃Al
(D) ¹³₁₄Al

Correct Answer: B

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Question (38)

QN006849

An atom with atomic number 20 and mass number 40 contains how many neutrons?

(A) 10
(B) 20
(C) 40
(D) 60

Correct Answer: B

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Question (39)

QN006850

Which statement best explains why electrons contribute very little to atomic mass?

(A) Electrons have no charge
(B) Electrons are absent in atoms
(C) Electron mass is extremely small compared to proton and neutron mass
(D) Electrons remain outside nucleus

Correct Answer: C

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Question (40)

QN006851

If the number of protons changes in an atom, the atom becomes —

(A) Same isotope
(B) Same element
(C) Different element
(D) Neutral atom

Correct Answer: C

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Question (31)

The mass number of an atom can never be —

Explanation:

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Question (32)

An atom has 20 neutrons and mass number 39. Its atomic number is —

Explanation:

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Question (33)

The total number of nucleons in an atom equals its —

Explanation:

Link:

Question (34)

Which subatomic particle determines the identity of an element?

Explanation:

Link:

Question (35)

A chlorine atom has 17 protons and 18 neutrons. Its mass number is —

Explanation:

Link:

Question (36)

If a neutral atom contains 15 electrons, the number of protons is —

Explanation:

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Question (37)

Which of the following is a correct representation of aluminium atom?

Explanation:

Link:

Question (38)

An atom with atomic number 20 and mass number 40 contains how many neutrons?

Explanation:

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Question (39)

Which statement best explains why electrons contribute very little to atomic mass?

Explanation:

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Question (40)

If the number of protons changes in an atom, the atom becomes —

Explanation:

Link:

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