Structure of Atom Test

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Structure of Atom Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has the highest energy?

A
Gamma rays

B
X-rays

C
Ultra-violet radiation

D
Infrared radiation

Solution

E = h.v the order of frequency is gamma rays > X-rays > ultra-violet radiation > infrared radiation.
Question 2
1 / -0

Anode rays were discovered by

A
E. Rutherford

B
J.J. Thomson

C
E. Goldstein

D
J. Chadwick

Solution

Goldstein (1900) discovered protons in Anode Ray experiments. Atoms contain positively charged particles called protons. Since atoms contain negatively charged particles, they must contain positively charged particles for them to be electrically neutral.
Question 3
1 / -0

Which of the following sets of orbitals is arranged in order of increasing energy?

A
3d < 4s < 4p < 5s < 4d

B
4s < 3d < 4p < 5s < 4d

C
4s < 3d < 4p < 5s < 4d

D
3d < 4s < 4p < 4d < 5s

Solution

This is based on Aufbau's principle; place the sub shell first which has lower value of (n + l), in case of tie sub shell having lower value of Principal quantum number is always given priority.
Question 4
1 / -0

Which quantum number determines the radius of an atom?

A
n and l

B
m

C
/

D
n

Solution

Principal quantum number(n) signifies the distance from the nucleus and the size of an atom.
Question 5
1 / -0

The ground state electron configuration of Fe is:

A
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

B
1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸

C
1s² 2s²3s^² 3p^⁶3d¹⁰

D
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²3d⁶

Solution

This is as per the various rules for filling of electrons in various orbitals i.e. Hund's rule of maximum multiplicity, Aufbau principle and Pauli exclusion principle.
Question 6
1 / -0

Which one of the following electronic configurations depict an oxygen atom?

A
1s²2s²2p¹

B
1s²2s²2p²

C
1s²2s²2p⁴

D
1s²2s²2p²3s²

Solution

This is as per the various rules for filling of electrons in various orbitals i.e. Hund's rule of maximum multiplicity, Aufbau principle and Pauli exclusion principle.

Element

Atomic number

Electronic Configuration

O

8

1s² 2s² 2p⁴

[He] 2s² 2p⁴
Question 7
1 / -0

The Pauli exclusion principle states that:

A
Both the position of an electron and its momentum cannot be known simultaneously very accurately.

B
The wavelength and mass of a subatomic particle are related by I = h/m v

C
The wavelength of a photon of light times its frequency is equal to the speed of light.

D
No two electrons in the same atom can have the same set of four quantum numbers.

Solution

Pauli exclusion principle states that no two electrons in the same atom can have the same set of four quantum numbers identical.

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Element	Atomic number	Electronic Configuration
O	8	1s² 2s² 2p⁴	[He] 2s² 2p⁴

Structure of Atom Test - 3

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Structure of Atom Test - 3

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Question 1

Gamma rays

X-rays

Ultra-violet radiation

Infrared radiation

Solution

Question 2

E. Rutherford

J.J. Thomson

E. Goldstein

J. Chadwick

Solution

Question 3

3d < 4s < 4p < 5s < 4d

4s < 3d < 4p < 5s < 4d

4s < 3d < 4p < 5s < 4d

3d < 4s < 4p < 4d < 5s

Solution

Question 4

n and l

m

/

n

Solution

Question 5

1s2 2s2 2p6 3s2 3p6 4s2

1s2 2s2 2p6 3s2 3p6 3d8

1s2 2s2 3s2 3p6 3d10

1s2 2s2 2p6 3s2 3p6 4s2 3d6

Solution

Question 6

1s22s22p1

1s22s22p2

1s22s22p4

1s22s22p23s2

Solution

Question 7

Both the position of an electron and its momentum cannot be known simultaneously very accurately.

The wavelength and mass of a subatomic particle are related by I = h/m v

The wavelength of a photon of light times its frequency is equal to the speed of light.

No two electrons in the same atom can have the same set of four quantum numbers.

Solution

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1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸

1s² 2s²3s^² 3p^⁶3d¹⁰

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²3d⁶

1s²2s²2p¹

1s²2s²2p²

1s²2s²2p⁴

1s²2s²2p²3s²