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Question (11)

QN0026396

Which of the following statements is true for cathode rays?

(A) They carry positive charge
(B) They are neutral
(C) They consist of electrons
(D) They consist of neutrons

Correct Answer: C

Explanation:

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Question (12)

QN0026397

The maximum number of electrons that can be accommodated in the L-shell is —

(A) 2
(B) 8
(C) 18
(D) 32

Correct Answer: B

Explanation:

L-shell can hold maximum 8 electrons for first 18 elements.

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Question (13)

QN0026398

An atom has electronic configuration 2, 8, 3. The element will most likely —

(A) Gain 3 electrons
(B) Lose 3 electrons
(C) Gain 5 electrons
(D) Share 8 electrons

Correct Answer: B

Explanation:

Valency = 3 by losing electrons.

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Question (14)

QN0026399

The number of neutrons in an atom having atomic number 11 and mass number 23 is —

(A) 11
(B) 12
(C) 23
(D) 34

Correct Answer: B

Explanation:

Neutrons = 23 − 11

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Question (15)

QN0026400

Which atomic model compared atom to a watermelon with seeds embedded in it?

(A) Rutherford’s model
(B) Dalton’s model
(C) Thomson’s model
(D) Bohr’s model

Correct Answer: C

Explanation:

Thomson proposed plum pudding model.

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Question (16)

QN0026401

An element has valency 2 and atomic number 12. Its electronic configuration is —

(A) 2, 8, 1
(B) 2, 8, 2
(C) 2, 8, 3
(D) 2, 6

Correct Answer: B

Explanation:

Total electrons = 12

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Question (17)

QN0026402

Which of the following particles is present outside the nucleus?

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

Correct Answer: C

Explanation:

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Question (18)

QN0026403

An atom contains 9 protons, 10 neutrons and 9 electrons. Which element is it most likely to represent?

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

Correct Answer: B

Explanation:

Atomic number = Number of protons = 9

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Question (19)

QN0026404

Which statement correctly explains why atoms are electrically neutral?

(A) Number of neutrons equals electrons
(B) Number of protons equals neutrons
(C) Number of protons equals electrons
(D) Number of shells equals electrons

Correct Answer: C

Explanation:

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Question (20)

QN0026405

An atom has electronic configuration 2, 8, 8, 1. What is its valency?

(A) 0
(B) 1
(C) 7
(D) 8

Correct Answer: B

Explanation:

One electron is lost to attain stable configuration.

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Question (11)

Which of the following statements is true for cathode rays?

Explanation:

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Question (12)

The maximum number of electrons that can be accommodated in the L-shell is —

Explanation:

Link:

Question (13)

An atom has electronic configuration 2, 8, 3. The element will most likely —

Explanation:

Link:

Question (14)

The number of neutrons in an atom having atomic number 11 and mass number 23 is —

Explanation:

Link:

Question (15)

Which atomic model compared atom to a watermelon with seeds embedded in it?

Explanation:

Link:

Question (16)

An element has valency 2 and atomic number 12. Its electronic configuration is —

Explanation:

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Question (17)

Which of the following particles is present outside the nucleus?

Explanation:

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Question (18)

An atom contains 9 protons, 10 neutrons and 9 electrons. Which element is it most likely to represent?

Explanation:

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Question (19)

Which statement correctly explains why atoms are electrically neutral?

Explanation:

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Question (20)

An atom has electronic configuration 2, 8, 8, 1. What is its valency?

Explanation:

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