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Question (21)

QN006732

Which shell has the least energy?

(A) L-shell
(B) M-shell
(C) N-shell
(D) K-shell

Correct Answer: D

Explanation:

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Question (22)

QN006733

The shell represented by n = 3 is —

(A) K-shell
(B) L-shell
(C) M-shell
(D) N-shell

Correct Answer: C

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Question (23)

QN006734

An electron can move from one shell to another by —

(A) Changing its charge
(B) Absorbing or releasing fixed energy
(C) Colliding with proton
(D) Changing atomic number

Correct Answer: B

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Question (24)

QN006735

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

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Question (25)

QN006736

The formula for maximum electrons in a shell is —

(A) n^2
(B) 2n
(C) 2n^2
(D) n^3

Correct Answer: C

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Question (26)

QN006737

The maximum number of electrons in the M-shell is —

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

Correct Answer: C

Explanation:

Use 2n^2 with n = 3.

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Question (27)

QN006738

Why are shells named K, L, M, N instead of A, B, C, D?

(A) Alphabet began from K
(B) Suggested by Dalton
(C) Adopted from Barkla’s X-ray notation
(D) Based on Greek language

Correct Answer: C

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Question (28)

QN006739

James Chadwick discovered —

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

Correct Answer: D

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Question (29)

QN006740

Which subatomic particle has no electrical charge?

(A) Electron
(B) Proton
(C) Neutron
(D) Alpha particle

Correct Answer: C

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Question (30)

QN006741

Hydrogen differs from most atoms because it generally lacks —

(A) Protons
(B) Electrons
(C) Neutrons
(D) Nucleus

Correct Answer: C

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