Structure of Atom Test

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Structure of Atom Test - 37

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Question 1
1 / -0

____________ is an obsolete scientific model of the atom proposed by J. J. Thomson in $$1904$$.

A
Musk melon model

B
Plum pudding model

C
Christmas melon model

D
Pudding model

Solution

J. J. Thomson proposed the model of an atom similar to a Christmas pudding or similar to a watermelon. His model of the atom is generally called the plum and pudding model of the atom.
Question 2
1 / -0

Thomson's model could not explain the :

A
stability of an atom

B
position of nucleus in an atom

C
scattering of alpha particles

D
all of above

Solution

Thomson model of an atom could not explain the stability of an atom, i.e., how a positive charge in the atom holds the negatively charged electrons. It could not explain the position of nucleus in an atom and the scattering of alpha particles.
Question 3
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 4
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The mass number of nucleus is :

A
Sometimes equal to its atomic number

B
Sometimes less than and sometimes more than its atomic number

C
Always less than its atomic number

D
Always more than its atomic number

Solution

Mass number of an element is the total number of protons and neutrons present inside the atomic nucleus of the element. It is represented by A. A is different for different elements. Mass number of a nucleus is sometimes equal to its atomic number, for example in case of hydrogen, number of neutrons $$= 0$$.
So, mass number $$=$$ atomic number.
Question 5
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 6
1 / -0

Which sublevel can occupy a maximum of 10 electrons?

A
s

B
f

C
p

D
d

Solution

s sub-level can occupy a maximum of 2 electrons.
p sub-level can occupy a maximum of 6 electrons.
d sub-level can occupy a maximum of 10 electrons.
f sub-level can occupy a maximum of 14 electrons.
Note: Each orbital can occupy 2 electrons.
s sub-level has only one orbital.
p sub-level has three orbitals.
d sub-level has five orbitals.
f sub-level has seven orbitals.
Question 7
1 / -0

How can an element be defined as consisting of any mixture of atoms with a given atomic number?

A
Determines the mass of of element in the mixture

B
Determines the chemical properties of an element

C
Both A and B

D
None of the above

Solution

The number of electrons in each element's electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. Hence, it is the atomic number alone that determines the chemical properties of an element; and it is for this reason that an element can be defined as consisting of any mixture of atoms with a given atomic number.
Question 8
1 / -0

The electronic configuration $$\displaystyle { 1s }^{ 2 },{ 2s }^{ 2 },{ 2p }^{ 6 },{ 3s }^{ 2 },{ 3p }^{ 6 },{ 3d }^{ 9 }$$ represents a:

A
metal atom

B
non-metal atom

C
non-metallic anion

D
metallic cation

Solution

In the given electronic configuration, total no. of electrons = 27.
For a neutral atom having 27e⁻ the electronic configuration will be:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d⁷.
Thus, it is not a neutral metal or non-metal atom.

We know that, 4s is filled before 3d according to the electronic configuration series. But in the given configuration, 4s orbital is empty and electrons are present in 3d which clearly indicates that electrons have been removed.
Thus, it represents a cation and not an anion.

Electronic configuration of Cu (29e⁻) : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s¹, 3d¹⁰
Electronic configuration of Cu²⁺ cation (removing 2 e⁻ from Cu) : 1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁹

Hence, the given electronic configuration represents a metallic cation (Cu²⁺) .
Question 9
1 / -0

Bohr's atom model assumes.

A
The nucleus is of infinite mass and is at rest

B
Electrons in a quantized orbit will not radiate energy

C
Mass of electron remains constant

D
All the above.
Solution
In 1913, Niels Bohr proposed a model for the hydrogen atom . The Bohr model was based on the following assumptions.
The electron in a hydrogen atom travels around the nucleus in a circular orbit.
The nucleus is of infinite mass and is rest.
Electrons in a quantized orbit will not radiate energy.
Mass of electron remains constant.
Question 10
1 / -0

J.J. Thomson received noble prize in the year:

A
$$1900$$

B
$$1906$$

C
$$1909$$

D
$$1920$$

Solution

J.J. Thomson received noble prize in the year $$1906$$ for his work on electrical conductivity of gases.

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Structure of Atom Test - 37

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Structure of Atom Test - 37

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SHARING IS CARING

Question 1

Musk melon model

Plum pudding model

Christmas melon model

Pudding model

Solution

Question 2

stability of an atom

position of nucleus in an atom

scattering of alpha particles

all of above

Solution

Question 3

water melon model

christmas pudding model

both a and b

none of above

Solution

Question 4

Sometimes equal to its atomic number

Sometimes less than and sometimes more than its atomic number

Always less than its atomic number

Always more than its atomic number

Solution

Question 5

nucleus

electrons

protons

all of the above

Solution

Question 6

s

f

p

d

Solution

Question 7

Determines the mass of of element in the mixture

Determines the chemical properties of an element

Both A and B

None of the above

Solution

Question 8

metal atom

non-metal atom

non-metallic anion

metallic cation

Solution

Question 9

The nucleus is of infinite mass and is at rest

Electrons in a quantized orbit will not radiate energy

Mass of electron remains constant

All the above.

Solution

Question 10

$$1900$$

$$1906$$

$$1909$$

$$1920$$

Solution

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