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Question (21)

QN006832

A neutral magnesium atom has atomic number 12. The number of electrons present is —

(A) 10
(B) 12
(C) 14
(D) 24

Correct Answer: B

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Question (22)

QN006833

If an atom contains 26 protons and 30 neutrons, its mass number is —

(A) 26
(B) 30
(C) 56
(D) 4

Correct Answer: C

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Question (23)

QN006834

Which of the following particles carries positive charge?

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

Correct Answer: B

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Question (24)

QN006835

The particle with no charge is —

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

Correct Answer: C

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Question (25)

QN006836

The number written at the top left side of an atomic symbol represents the —

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

Correct Answer: C

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Question (26)

QN006837

The number written at the lower left side of an atomic symbol represents the —

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

Correct Answer: A

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Question (27)

QN006838

An atom has 31 protons and 39 neutrons. Its mass number is —

(A) 31
(B) 39
(C) 70
(D) 8

Correct Answer: C

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Question (28)

QN006839

A neutral atom has mass number 27 and atomic number 13. The number of electrons is —

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

Correct Answer: A

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Question (29)

QN006840

Which statement about electrons is correct in relation to atomic mass?

(A) They contribute maximum mass
(B) Their mass is negligible
(C) Their mass equals neutron mass
(D) Their mass equals proton mass

Correct Answer: B

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Question (30)

QN006841

If the atomic number of an element is 9, its nucleus must contain —

(A) 9 neutrons
(B) 9 protons
(C) 18 nucleons
(D) 9 electrons only

Correct Answer: B

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Question (21)

A neutral magnesium atom has atomic number 12. The number of electrons present is —

Explanation:

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Question (22)

If an atom contains 26 protons and 30 neutrons, its mass number is —

Explanation:

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Question (23)

Which of the following particles carries positive charge?

Explanation:

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Question (24)

The particle with no charge is —

Explanation:

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Question (25)

The number written at the top left side of an atomic symbol represents the —

Explanation:

Link:

Question (26)

The number written at the lower left side of an atomic symbol represents the —

Explanation:

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Question (27)

An atom has 31 protons and 39 neutrons. Its mass number is —

Explanation:

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Question (28)

A neutral atom has mass number 27 and atomic number 13. The number of electrons is —

Explanation:

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Question (29)

Which statement about electrons is correct in relation to atomic mass?

Explanation:

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Question (30)

If the atomic number of an element is 9, its nucleus must contain —

Explanation:

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