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Question (1)

QN006812

The major contribution to the mass of an atom comes from —

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

Correct Answer: B

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Question (2)

QN006813

The mass of an electron is approximately —

(A) Equal to proton mass
(B) Equal to neutron mass
(C) Negligible compared to proton mass
(D) Greater than neutron mass

Correct Answer: C

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Question (3)

QN006814

The central region of an atom containing protons and neutrons is called the —

(A) Orbit
(B) Shell
(C) Nucleus
(D) Valence zone

Correct Answer: C

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Question (4)

QN006815

The number of protons present in the nucleus determines the —

(A) Mass number
(B) Atomic number
(C) Valency
(D) Isotope type

Correct Answer: B

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Question (5)

QN006816

The sum of protons and neutrons in an atom is known as the —

(A) Atomic number
(B) Electron number
(C) Mass number
(D) Valency

Correct Answer: C

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Question (6)

QN006817

The particles present inside the nucleus are collectively called —

(A) Electrons
(B) Isobars
(C) Nucleons
(D) Isotopes

Correct Answer: C

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Question (7)

QN006818

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

(A) 12
(B) 24
(C) 36
(D) 48

Correct Answer: B

Explanation:

Mass number = protons + neutrons.

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Question (8)

QN006819

An atom contains 19 protons and 20 neutrons. Its atomic number is —

(A) 20
(B) 19
(C) 39
(D) 1

Correct Answer: B

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Question (9)

QN006820

If an atom has atomic number 15 and mass number 31, the number of neutrons is —

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

Correct Answer: B

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Question (10)

QN006821

The symbol ²³₁₁Na represents sodium with —

(A) 11 neutrons
(B) 23 electrons
(C) 11 protons and 12 neutrons
(D) 23 protons and 11 neutrons

Correct Answer: C

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Question (1)

The major contribution to the mass of an atom comes from —

Explanation:

Link:

Question (2)

The mass of an electron is approximately —

Explanation:

Link:

Question (3)

The central region of an atom containing protons and neutrons is called the —

Explanation:

Link:

Question (4)

The number of protons present in the nucleus determines the —

Explanation:

Link:

Question (5)

The sum of protons and neutrons in an atom is known as the —

Explanation:

Link:

Question (6)

The particles present inside the nucleus are collectively called —

Explanation:

Link:

Question (7)

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

Explanation:

Link:

Question (8)

An atom contains 19 protons and 20 neutrons. Its atomic number is —

Explanation:

Link:

Question (9)

If an atom has atomic number 15 and mass number 31, the number of neutrons is —

Explanation:

Link:

Question (10)

The symbol ²³₁₁Na represents sodium with —

Explanation:

Link:

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