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Question (11)

QN006822

A neutral atom with atomic number 8 contains how many electrons?

(A) 16
(B) 8
(C) 10
(D) 6

Correct Answer: B

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Question (12)

QN006823

An atom has mass number 40 and atomic number 18. Number of neutrons is —

(A) 18
(B) 22
(C) 40
(D) 58

Correct Answer: B

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Question (13)

QN006824

Which subatomic particle contributes least to the mass of an atom?

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

Correct Answer: C

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Question (14)

QN006825

The atomic number of carbon is 6. A neutral carbon atom contains —

(A) 6 protons and 6 electrons
(B) 6 neutrons and 6 electrons only
(C) 12 protons
(D) 6 protons and 12 electrons

Correct Answer: A

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Question (15)

QN006826

Which statement is correct?

(A) Atomic number = neutrons + electrons
(B) Mass number = protons + neutrons
(C) Atomic number = mass number
(D) Neutrons determine atomic number

Correct Answer: B

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Question (16)

QN006827

If the number of neutrons in an atom increases while protons remain same, the atom becomes —

(A) An ion
(B) An isotope
(C) An isobar
(D) Neutral gas

Correct Answer: B

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Question (17)

QN006828

Hydrogen-1 differs from Hydrogen-2 because they have different numbers of —

(A) Protons
(B) Electrons
(C) Neutrons
(D) Shells

Correct Answer: C

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Question (18)

QN006829

An atom contains 17 electrons and 20 neutrons. Its mass number is 37. The number of protons is —

(A) 17
(B) 20
(C) 37
(D) 57

Correct Answer: A

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Question (19)

QN006830

Which quantity remains same for all isotopes of an element?

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

Correct Answer: C

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Question (20)

QN006831

The notation ¹⁴₆C indicates that carbon has —

(A) 6 neutrons
(B) 8 protons
(C) 6 protons and 8 neutrons
(D) 14 protons

Correct Answer: C

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Question (11)

A neutral atom with atomic number 8 contains how many electrons?

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Question (12)

An atom has mass number 40 and atomic number 18. Number of neutrons is —

Explanation:

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Question (13)

Which subatomic particle contributes least to the mass of an atom?

Explanation:

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Question (14)

The atomic number of carbon is 6. A neutral carbon atom contains —

Explanation:

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Question (15)

Which statement is correct?

Explanation:

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Question (16)

If the number of neutrons in an atom increases while protons remain same, the atom becomes —

Explanation:

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Question (17)

Hydrogen-1 differs from Hydrogen-2 because they have different numbers of —

Explanation:

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Question (18)

An atom contains 17 electrons and 20 neutrons. Its mass number is 37. The number of protons is —

Explanation:

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Question (19)

Which quantity remains same for all isotopes of an element?

Explanation:

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Question (20)

The notation ¹⁴₆C indicates that carbon has —

Explanation:

Link:

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