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Question (31)

QN006942

The atomic number of sulfur is 16. The number of protons in sulfur atom is —

(A) 8
(B) 16
(C) 32
(D) 48

Correct Answer: B

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Question (32)

QN006943

Which element has atomic number 1?

(A) Helium
(B) Hydrogen
(C) Lithium
(D) Carbon

Correct Answer: B

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Question (33)

QN006944

An atom has atomic number 3. It contains how many electrons in neutral state?

(A) 6
(B) 2
(C) 3
(D) 1

Correct Answer: C

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Question (34)

QN006945

The atomic number of chlorine is 17. Chloride ion contains —

(A) 16 electrons
(B) 17 electrons
(C) 18 electrons
(D) 19 electrons

Correct Answer: C

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Question (35)

QN006946

Which of the following has highest atomic number?

(A) Carbon
(B) Oxygen
(C) Neon
(D) Magnesium

Correct Answer: D

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Question (36)

QN006947

If an atom loses one electron, its atomic number —

(A) Increases by 1
(B) Decreases by 1
(C) Remains unchanged
(D) Becomes zero

Correct Answer: C

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Question (37)

QN006948

The atomic number of potassium is —

(A) 17
(B) 18
(C) 19
(D) 20

Correct Answer: C

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Question (38)

QN006949

An atom with atomic number 2 is chemically classified as —

(A) Alkali metal
(B) Halogen
(C) Noble gas
(D) Transition metal

Correct Answer: C

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Question (39)

QN006950

The number of electrons in Na⁺ ion is —

(A) 10
(B) 11
(C) 12
(D) 23

Correct Answer: A

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Question (40)

QN006951

The atomic number is useful because it helps identify the —

(A) Shape of atom
(B) Colour of atom
(C) Element uniquely
(D) Physical state only

Correct Answer: C

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