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Question (41)

QN006852

A sodium atom contains 11 protons and 12 neutrons. The number of nucleons is —

(A) 11
(B) 12
(C) 23
(D) 1

Correct Answer: C

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Question (42)

QN006853

Which quantity is always equal to the number of electrons in a neutral atom?

(A) Neutron number
(B) Mass number
(C) Atomic mass
(D) Atomic number

Correct Answer: D

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Question (43)

QN006854

An atom has 8 protons, 8 electrons and 10 neutrons. Its mass number is —

(A) 8
(B) 10
(C) 16
(D) 18

Correct Answer: D

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Question (44)

QN006855

The identity of an element remains unchanged if only the number of —

(A) Protons changes
(B) Electrons changes in neutral atom
(C) Neutrons changes
(D) Protons and neutrons both change

Correct Answer: C

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Question (45)

QN006856

Which of the following atoms has the greatest mass number?

(A) 8 protons, 8 neutrons
(B) 10 protons, 10 neutrons
(C) 12 protons, 14 neutrons
(D) 15 protons, 9 neutrons

Correct Answer: C

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Question (46)

QN006857

An atom represented as ³¹₁₅P contains how many neutrons?

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

Correct Answer: B

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Question (47)

QN006858

The nucleus of an atom contributes most to the atom’s —

(A) Colour
(B) Volume
(C) Mass
(D) Chemical reactivity

Correct Answer: C

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Question (48)

QN006859

Which statement is true for all neutral atoms?

(A) Protons = neutrons
(B) Electrons = neutrons
(C) Protons = electrons
(D) Mass number = atomic number

Correct Answer: C

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Question (49)

QN006860

If the mass number of an atom is 52 and it has 24 protons, the number of neutrons is —

(A) 24
(B) 28
(C) 52
(D) 76

Correct Answer: B

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Question (50)

QN006861

The concept of mass number helps scientists determine the total number of —

(A) Electrons only
(B) Protons only
(C) Neutrons only
(D) Nucleons in the nucleus

Correct Answer: D

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Question (41)

A sodium atom contains 11 protons and 12 neutrons. The number of nucleons is —

Explanation:

Link:

Question (42)

Which quantity is always equal to the number of electrons in a neutral atom?

Explanation:

Link:

Question (43)

An atom has 8 protons, 8 electrons and 10 neutrons. Its mass number is —

Explanation:

Link:

Question (44)

The identity of an element remains unchanged if only the number of —

Explanation:

Link:

Question (45)

Which of the following atoms has the greatest mass number?

Explanation:

Link:

Question (46)

An atom represented as ³¹₁₅P contains how many neutrons?

Explanation:

Link:

Question (47)

The nucleus of an atom contributes most to the atom’s —

Explanation:

Link:

Question (48)

Which statement is true for all neutral atoms?

Explanation:

Link:

Question (49)

If the mass number of an atom is 52 and it has 24 protons, the number of neutrons is —

Explanation:

Link:

Question (50)

The concept of mass number helps scientists determine the total number of —

Explanation:

Link:

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