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Question (21)

QN006932

An atom has atomic number 7. Which element is it?

(A) Oxygen
(B) Nitrogen
(C) Carbon
(D) Fluorine

Correct Answer: B

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Question (22)

QN006933

The atomic number of calcium is 20. The number of electrons in Ca²⁺ ion is —

(A) 18
(B) 20
(C) 22
(D) 40

Correct Answer: A

Explanation:

Ca²⁺ loses 2 electrons.

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Question (23)

QN006934

Which quantity remains same in isotopes of an element?

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

Correct Answer: C

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Question (24)

QN006935

The atomic number of aluminium is 13. The total positive charge in its nucleus is due to —

(A) 13 neutrons
(B) 13 electrons
(C) 13 protons
(D) 26 nucleons

Correct Answer: C

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Question (25)

QN006936

The atomic number of neon is —

(A) 8
(B) 10
(C) 12
(D) 18

Correct Answer: B

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Question (26)

QN006937

An atom with atomic number 14 belongs to —

(A) Silicon
(B) Sulfur
(C) Sodium
(D) Scandium

Correct Answer: A

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Question (27)

QN006938

The number of protons in the nucleus of fluorine atom is 9. Its atomic number is —

(A) 18
(B) 10
(C) 9
(D) 1

Correct Answer: C

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Question (28)

QN006939

Which statement is false?

(A) Atomic number equals number of protons
(B) Neutral atom has equal protons and electrons
(C) Atomic number may be fractional
(D) Every element has unique atomic number

Correct Answer: C

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Question (29)

QN006940

An atom has 11 protons, 11 electrons and 12 neutrons. Its atomic number is —

(A) 11
(B) 12
(C) 22
(D) 23

Correct Answer: A

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Question (30)

QN006941

Which subatomic particle directly determines atomic number?

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

Correct Answer: B

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Question (21)

An atom has atomic number 7. Which element is it?

Explanation:

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Question (22)

The atomic number of calcium is 20. The number of electrons in Ca²⁺ ion is —

Explanation:

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Question (23)

Which quantity remains same in isotopes of an element?

Explanation:

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Question (24)

The atomic number of aluminium is 13. The total positive charge in its nucleus is due to —

Explanation:

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Question (25)

The atomic number of neon is —

Explanation:

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Question (26)

An atom with atomic number 14 belongs to —

Explanation:

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Question (27)

The number of protons in the nucleus of fluorine atom is 9. Its atomic number is —

Explanation:

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Question (28)

Which statement is false?

Explanation:

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Question (29)

An atom has 11 protons, 11 electrons and 12 neutrons. Its atomic number is —

Explanation:

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Question (30)

Which subatomic particle directly determines atomic number?

Explanation:

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