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Question (41)

QN006952

An atom contains 24 protons. Identify its atomic number.

(A) 12
(B) 24
(C) 48
(D) 72

Correct Answer: B

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Question (42)

QN006953

The atomic number of phosphorus is 15. The number of electrons in P³⁻ ion is —

(A) 12
(B) 15
(C) 18
(D) 30

Correct Answer: C

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Question (43)

QN006954

Which element has atomic number 8?

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

Correct Answer: B

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Question (44)

QN006955

If two atoms have different atomic numbers, they belong to —

(A) Same isotope
(B) Same element
(C) Different elements
(D) Same compound

Correct Answer: C

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Question (45)

QN006956

The atomic number of lithium is 3. The number of protons and electrons respectively are —

(A) 3 and 3
(B) 3 and 4
(C) 4 and 3
(D) 6 and 3

Correct Answer: A

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Question (46)

QN006957

Which of the following atomic numbers belongs to a noble gas?

(A) 2
(B) 3
(C) 11
(D) 17

Correct Answer: A

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Question (47)

QN006958

An atom has atomic number 26. The positive charge inside the nucleus is due to —

(A) 26 neutrons
(B) 26 electrons
(C) 26 protons
(D) 52 nucleons

Correct Answer: C

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Question (48)

QN006959

The atomic number of an atom can never be —

(A) Positive integer
(B) Whole number
(C) Fractional number
(D) Equal to number of protons

Correct Answer: C

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Question (49)

QN006960

Which quantity changes when an atom forms a positive ion?

(A) Atomic number
(B) Number of protons
(C) Number of electrons
(D) Number of neutrons

Correct Answer: C

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Question (50)

QN006961

The modern periodic table is arranged in increasing order of —

(A) Atomic mass
(B) Atomic number
(C) Valency
(D) Density

Correct Answer: B

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