Structure of Atom Test

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Structure of Atom Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following was not proposed by Thomson?

A
The negative and positive charges are equal in magnitude

B
The electrons revolve around the nucleus in circular paths

C
The electrons are embedded in a positive sphere

D
Atoms are electrically neutral

Solution

The electrons revolve around the nucleus in circular paths was first proposed by Rutherford, not by Thomson.
Question 2
1 / -0

Which of the following statement is incorrect according to Thomson's model of an atom?

A
The electrons, in a sphere of positive charge, were like currants (dry fruits) in a spherical Christmas pudding.

B
The positive charge in the atom is spread all over like the red edible part of the watermelon.

C
The electrons are studded in the positively charged sphere, like the seeds in the watermelon.

D
The protons are studded in the positively charged sphere, like the seeds in the watermelon.

Solution

Thomson proposed the model of an atom be similar to that of a Christmas pudding. The electrons, in a sphere of positive charge, were like currants (dry fruits) in a spherical Christmas pudding.
One can also think of a watermelon, the positive charge in the atom is spread all over like the red edible part of the watermelon, while the electrons are studded in the positively charged sphere, like the seeds in the watermelon.
Question 3
1 / -0

Thomson's model was rejected because :

A
it was not clearly specified in detail

B
it could not explain how both positively and negatively charged particles protect their identity being together

C
it does not explain any repulsions which might result since all the positive charges are together in an cluster and same is the case with negative charges as well

D
All of these

Solution

Thomson's model was rejected because it could not explain how both positively and negatively charged particles protect their identity being together.
Question 4
1 / -0

According to J.J. Thomson's atomic model, negative charges are embedded in:

A
a positively charged sphere

B
a lump of neutral charge

C
a lump of small atoms

D
None of the above

Solution

According to J.J. Thomson's atomic model, negative charges are embedded in a positively charged sphere.
We can think of a watermelon where the positive charge in the atom is spread all over like the red edible part of the watermelon, while the electrons are embedded in the positively charged sphere, like its seeds.
Question 5
1 / -0

Thomson proposed that:

A
an atom consists of a positively charged sphere and electrons are embedded in it.

B
negative and positive charges are equal in magnitude. So that atoms as a whole are electrically neutral.

C
Both $$A$$ and $$B$$

D
None of above
Solution
Thomson proposed that :
- An atom consists of a positively charged sphere and the electrons are embedded in it. Thus, the atom is visualised as pudding or cake of positive charges with raisins (electrons) embedded into it. Hence it is raisin pudding model or watermelon model.
- The negative and positive charges are equal in magnitude. So that atom as a whole is electrically neutral.
Question 6
1 / -0

The energy of an electron depends on the size of the .....

A
orbit

B
orbitals

C
both $$A$$ and $$B$$

D
none of the above

Solution

According to quantum mechanics, energy of an electron depends only upon the principal quantum number or orbit.
Question 7
1 / -0

In Thomson's plum-pudding model, electrons are not:

A
negatively charged

B
present in every type of atom

C
collected together in the center of the atom

D
scattered throughout a blob of positively charged material

Solution

In Thomsons plum-pudding model, electrons are not collected together in the center of the atom, rather they are scattered in the atom.
Question 8
1 / -0

The Balmer series of hydrogen spectra lies in:

A
visible region spectra

B
ultra violet spectra

C
infrared region spectra

D
$$\gamma$$-rays spectra

Solution

Balmer series lies in the visible region of the electromagnetic spectrum. This series is obtained only in the emission spectrum.

Hence, photons that correspond to these energies will not be strongly absorbed. In highly excited hydrogen gas there is the possibility for detecting absorption at Balmer line wavelengths.

Paschen series lies in the infrared region while Brackett and Pfund lie also in the infrared region.

Only Lyman series lies in the ultraviolet region of the electromagnetic spectrum.
Question 9
1 / -0

How would you describe J. J. Thomsons model of the atom?

A
An atom is indivisible

B
The atom is composed of only negatively charged particles.

C
The atom is composed of a positive core with negatively charged particles orbiting the positive core.

D
The atom is composed of diffused ball of positive charge with negative particles dispersed throughout.

Solution

The atom is composed of diffuse ball of positive charge with negative particles dispersed throughout like a watermelon where the red part is the positive sphere and the seeds represent negatively charged particles.

Hence, the correct option is $$D$$.
Question 10
1 / -0

Atomic mass of chlorine atom is _______.

A
35.5

B
16

C
32

D
24

Solution

Atomic mass of chlorine atom is 35.5.
The atomic mass of Cl atom is equals to 35.453 atomic mass units. This is the weighted average mass of chlorine, including its isotopes, as found in nature. This also means that one mole of chlorine atoms has a mass of 35.453 grams.

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Structure of Atom Test - 35

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Structure of Atom Test - 35

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Question 1

The negative and positive charges are equal in magnitude

The electrons revolve around the nucleus in circular paths

The electrons are embedded in a positive sphere

Atoms are electrically neutral

Solution

Question 2

The electrons, in a sphere of positive charge, were like currants (dry fruits) in a spherical Christmas pudding.

The positive charge in the atom is spread all over like the red edible part of the watermelon.

The electrons are studded in the positively charged sphere, like the seeds in the watermelon.

The protons are studded in the positively charged sphere, like the seeds in the watermelon.

Solution

Question 3

it was not clearly specified in detail

it could not explain how both positively and negatively charged particles protect their identity being together

it does not explain any repulsions which might result since all the positive charges are together in an cluster and same is the case with negative charges as well

All of these

Solution

Question 4

a positively charged sphere

a lump of neutral charge

a lump of small atoms

None of the above

Solution

Question 5

an atom consists of a positively charged sphere and electrons are embedded in it.

negative and positive charges are equal in magnitude. So that atoms as a whole are electrically neutral.

Both $$A$$ and $$B$$

None of above

Solution

Question 6

orbit

orbitals

both $$A$$ and $$B$$

none of the above

Solution

Question 7

negatively charged

present in every type of atom

collected together in the center of the atom

scattered throughout a blob of positively charged material

Solution

Question 8

visible region spectra

ultra violet spectra

infrared region spectra

$$\gamma$$-rays spectra

Solution

Question 9

An atom is indivisible

The atom is composed of only negatively charged particles.

The atom is composed of a positive core with negatively charged particles orbiting the positive core.

The atom is composed of diffused ball of positive charge with negative particles dispersed throughout.

Solution

Question 10

35.5

16

32

24

Solution

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