Structure of the Atoms Test

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Structure of the Atoms Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following elements has odd number of electrons in its valence shell?

A
Hydrogen

B
Chlorine

C
Nitrogen

D
All of the above

Solution

The electronic configuration of hydrogen is $$1$$. The electronic configuration of chlorine is $$2,\,8,\,7$$. The electronic configuration of nitrogen is $$2,\,5$$. Therefore the valence shell of all the atoms has odd electrons.
Question 2
1 / -0

Most of the mass of the atom resides in the _____ .

A
nucleus

B
protons

C
neutrons

D
orbit

Solution

Most of the mass of the atom resides in the nucleus because of presence of protons and neutrons in the nucleus.
Question 3
1 / -0

The electronic configuration of aluminium is:

A
$$\boxed {\begin{matrix} K& L&M \\ 2&8 & 3\end{matrix} } $$

B
$$\boxed {\begin{matrix} K& L&M&N \\ 1&2&8 & 3\end{matrix} } $$

C
$$\boxed {\begin{matrix} P&Q&R\\ 2&8 & 3\end{matrix} } $$

D
None of the above

Solution

Atomic number of aluminium = 13. Therefore number of electrons = 13. Thus, electronic configuration of aluminium is $$\underset{2\quad 8 \quad 3}{K \ L \ M}$$.
Question 4
1 / -0

Fill in the blank and complete the analogy by choosing correct alternative from the options given.
Neon : (2, 8) : : Argon : _________

A
(2, 8, 8)

B
(2, 8, 8, 8)

C
(2, 8, 18, 8)

D
(2, 8, 18)

Solution

The atomic number of Argon is 18. So, the electronic configuration of Argon is 2, 8, 8.
Hence, the correct option is $$A$$.
Question 5
1 / -0

Which element has three shells with $$5$$ electrons in its valence shell?

A
Nitrogen

B
Silicon

C
Phosphorous

D
Sulphur

Solution

The electronic configuration of phosphorous is $$2,\,8,\,5$$. Thus it has three shells and $$5$$ electrons in its outermost shell.
Hence, option C is correct.
Question 6
1 / -0

In 1911, __________ came to the conclusion that the atom had a dense nucleus because most of the particles shot straight through, but some of the particles were deflected due to the dense nucleus of the gold atoms.

A
Thomson

B
Chadwick

C
Rutherford

D
None of the above

Solution

In 1911, Rutherford came to the conclusion that the atom had a dense nucleus because most of the particles shot straight through, but some of the particles were deflected due to the dense nucleus of the gold atoms.
Question 7
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 8
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 9
1 / -0

Rutherford's alpha-particle scattering experiment was responsible for the discovery of:

A
atomic nucleus

B
electron

C
proton

D
neutron

Solution

Rutherford's alpha-particle scattering experiment was responsible for the discovery of atomic nucleus. Nucleus contains most of the mass. Most of the atom has empty space.
Question 10
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.

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Structure of the Atoms Test - 38

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Structure of the Atoms Test - 38

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Question 1

Hydrogen

Chlorine

Nitrogen

All of the above

Solution

Question 2

nucleus

protons

neutrons

orbit

Solution

Question 3

$$\boxed {\begin{matrix} K& L&M \\ 2&8 & 3\end{matrix} } $$

$$\boxed {\begin{matrix} K& L&M&N \\ 1&2&8 & 3\end{matrix} } $$

$$\boxed {\begin{matrix} P&Q&R\\ 2&8 & 3\end{matrix} } $$

None of the above

Solution

Question 4

(2, 8, 8)

(2, 8, 8, 8)

(2, 8, 18, 8)

(2, 8, 18)

Solution

Question 5

Nitrogen

Silicon

Phosphorous

Sulphur

Solution

Question 6

Thomson

Chadwick

Rutherford

None of the above

Solution

Question 7

a positively charged sphere

a lump of neutral charge

a lump of small atoms

None of the above

Solution

Question 8

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 9

atomic nucleus

electron

proton

neutron

Solution

Question 10

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

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