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Question (11)

QN006922

An element has atomic number 20. The number of protons present is —

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

Correct Answer: B

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Question (12)

QN006923

Which statement about atomic number is correct?

(A) It can change during ordinary chemical reactions
(B) It is always greater than mass number
(C) It is unique for every element
(D) It equals number of neutrons

Correct Answer: C

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Question (13)

QN006924

The atomic number of hydrogen is —

(A) 0
(B) 1
(C) 2
(D) 8

Correct Answer: B

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Question (14)

QN006925

If an atom has 9 electrons and is neutral, its atomic number is —

(A) 18
(B) 0
(C) 9
(D) 1

Correct Answer: C

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Question (15)

QN006926

The atomic number of an atom does not depend on the number of —

(A) Protons
(B) Electrons
(C) Neutrons
(D) Positive charges

Correct Answer: C

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Question (16)

QN006927

Which element has atomic number 12?

(A) Magnesium
(B) Carbon
(C) Aluminium
(D) Silicon

Correct Answer: A

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Question (17)

QN006928

An atom contains 15 protons and 16 neutrons. Its atomic number is —

(A) 31
(B) 16
(C) 15
(D) 1

Correct Answer: C

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Question (18)

QN006929

The number of electrons in a neutral atom of atomic number 18 is —

(A) 8
(B) 18
(C) 36
(D) 20

Correct Answer: B

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Question (19)

QN006930

Which of the following pairs has the same atomic number?

(A) Isotopes of chlorine
(B) Sodium and magnesium
(C) Carbon and oxygen
(D) Nitrogen and neon

Correct Answer: A

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Question (20)

QN006931

The atomic number helps in arranging elements in the —

(A) Laboratory
(B) Periodic table
(C) Molecule
(D) Compound

Correct Answer: B

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