Structure of the Atoms Test

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Structure of the Atoms Test - 40

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Question 1
1 / -0

Thomson's atomic model is also called :

A
water melon model

B
christmas pudding model

C
both a and b

D
none of above

Solution

Thomson's atomic model is also called the watermelon model or Christmas pudding model. He compared the electrons with the raisins in the spherical Christmas pudding and to seeds in a watermelon.
Question 2
1 / -0

The plum pudding model proposed that ____________ are embedded in a charged sphere.

A
nucleus

B
electrons

C
protons

D
all of the above

Solution

J.J. Thomson was the first to put forward a model to explain the structure of an atom. According to this model, the atom consists of a positively charged sphere with electrons embedded in it.
Therefore, the correct option is B.
Question 3
1 / -0

Which of the following particle has mass closest to the mass of a proton?

A
Neutron

B
Hydrogen molecule

C
Alpha particle

D
Positron

E
Electron

Solution

Neutron has closest mass to a proton. The mass of proton and neutron are 1.0073 amu and 1.0087 amu respectively. Mass of electron is much lower than that of proton and neutron
Question 4
1 / -0

Which of the following was not a conclusion of Rutherford's gold foil experiment?

A
The atom is mainly empty space.

B
The nucleus has a negative charge.

C
The atom has a dense nucleus.

D
Alpha particles can pass through a thin sheet of gold foil.

E
All of the above are correct regarding the gold foil experiment.

Solution

The Rutherford gold leaf experiment concluded that most (99%) of all the mass of an atom is in the nucleus of the atom, that the nucleus is very small ($$10^5$$ times small than the size of the atom) and that is is positively charged.
Question 5
1 / -0

Statement I: Rutherford in his experiment observed that, most of the alpha particles passed straight through a thin sheet of gold foil.
Statement II: Most of the space inside the atom is empty.

A
Both statements I and II are true.

B
Statement I is true and statement II is false.

C
Statement I is false and statement II is true.

D
Both statement I and II are false.

E
Ambiguous

Solution

Most of the space inside the atom is empty. This proved to be true when Rutherford observed that most of the $$\alpha$$-particles passed through the gold foil without getting deflected.
The above statements are true and one of the conclusions of Rutherford's experiment.
Question 6
1 / -0

Statement 1: A large number of alpha particles were deflected in the Rutherford experiment.
Statement 2: Alpha particles that came close to the nucleus were deflected.

A
Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

B
Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

C
Statement 1 is correct but Statement 2 is not correct.

D
Statement 1 is not correct but Statement 2 is correct.

E
Both the Statement 1 and Statement 2 is not correct.

Solution

Statement 1 not correct because only a few alpha particles were deflected in the Rutherford experiment. Most alpha particles passed without deflection as most part of the atom is empty.
Statement 2 is correct because alpha particles that came close to the positively charged nucleus were deflected.

Hence, option $$C$$ is correct i.e. Statement 1 is not correct but Statement 2 is correct.
Question 7
1 / -0

Statement 1: Neutrons and protons are classified as nucleons.
Statement 2: Neutrons and protons are both located in the energy levels of the atom.

A
Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

B
Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

C
Statement 1 is correct but Statement 2 is not correct.

D
Statement 1 is not correct but Statement 2 is correct.

E
Both the Statement 1 and Statement 2 are not correct.

Solution

A nucleon is a collective name for two important subatomic particles: neutrons and protons. A nucleon is one of either of the two types of subatomic particles (neutrons and protons) which are located in the nucleus of atoms.
electrons are located in the principal energy levels of the atoms so statement 2 is not correct because neutron and proton stay in the nucleus of an atom.
Question 8
1 / -0

Who postulated that electrons revolve in orbits around the nucleus?

A
Bohr model

B
deBroglie's wave hypothesis

C
Heisenberg's uncertainty principle

D
Dalton

E
Rutherford

Solution

According to Bohr's model, electrons revolve around the nucleus in fixed energy orbits.
Question 9
1 / -0

Which of the following is not a conclusion of Rutherford experiment?

A
An atom has a very small compact nucleus

B
An atom is mainly empty space

C
An atom's mass is concentrated in the nucleus

D
An atom has a very dense nucleus

E
An atom has a negatively charged nucleus

Solution

The statement $$(E)$$ is not a conclusion of Rutherford experiment
An atom has a positively charged nucleus.
The following are the conclusions from Rutherford’s scattering experiment.
1. Many alpha particles pass without deflection. Atom has most of the space as empty.
2. Some alpha- particles deflect by $$90^{o}$$ or even larger angles. This is due to repulsion in like charges. Hence, the heavy core of the atom is positively charged and is termed the nucleus.
3. Very few alpha particles bounced back. The nucleus occupies a very small volume as compared to atomic volume.
4. The alpha- particles having significant mass are deflected by the nucleus. Hence almost the entire mass of the atom is concentrated at its center which is the nucleus.

Hence. option $$E$$ is the correct choice here.
Question 10
1 / -0

Which property of atom was explained in Thomson's model?

A
Charge

B
Nuetrons

C
Stability

D
Nuetrality

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Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 40

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Structure of the Atoms Test - 40

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SHARING IS CARING

Question 1

water melon model

christmas pudding model

both a and b

none of above

Solution

Question 2

nucleus

electrons

protons

all of the above

Solution

Question 3

Neutron

Hydrogen molecule

Alpha particle

Positron

Electron

Solution

Question 4

The atom is mainly empty space.

The nucleus has a negative charge.

The atom has a dense nucleus.

Alpha particles can pass through a thin sheet of gold foil.

All of the above are correct regarding the gold foil experiment.

Solution

Question 5

Both statements I and II are true.

Statement I is true and statement II is false.

Statement I is false and statement II is true.

Both statement I and II are false.

Ambiguous

Solution

Question 6

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

Statement 1 is correct but Statement 2 is not correct.

Statement 1 is not correct but Statement 2 is correct.

Both the Statement 1 and Statement 2 is not correct.

Solution

Question 7

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

Statement 1 is correct but Statement 2 is not correct.

Statement 1 is not correct but Statement 2 is correct.

Both the Statement 1 and Statement 2 are not correct.

Solution

Question 8

Bohr model

deBroglie's wave hypothesis

Heisenberg's uncertainty principle

Dalton

Rutherford

Solution

Question 9

An atom has a very small compact nucleus

An atom is mainly empty space

An atom's mass is concentrated in the nucleus

An atom has a very dense nucleus

An atom has a negatively charged nucleus

Solution

Question 10

Charge

Nuetrons

Stability

Nuetrality

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