Atomic Structure Test

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Atomic Structure Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements contradicts Dalton's atomic theory?

A
A chemical change involves rearrangement of atoms.

B
Atoms form ions by gain or loss of electrons.

C
The number of atoms may change when a substance changes from solid to gaseous state.

D
Total number of atoms during a chemical change remains unaltered.

Solution

The statement that contradicts Dalton's atomic theory is that atoms form ions by gain or loss of electrons.
Question 2
1 / -0

Canal ray experiment lead to the discovery of

A
protons

B
neutrons

C
electrons

D
nucleus

Solution

Canal ray experiment lead to the discovery of protons.
Question 3
1 / -0

The nucleus of deuterium contains

A
1 proton and 2 neutrons

B
1 proton

C
1 proton and 1 neutron

D
1 proton and 3 neutrons

Solution

The nucleus of deuterium contains 1 proton and 1 neutron.
Question 4
1 / -0

An element has two isotopes with mass numbers 16 and 18 and their average atomic weight is 16.5. What will be the percentage composition of these isotopes?

A
75%, 25%

B
35%, 65%

C
50%, 50%

D
33.33%, 66.67%

Solution

(16) (x) + (18) (1 - x) = 16.5
Solving gives:16x + 18 - 18x = 16.5

Simplifying this, we get
-2x + 18 = 16.5

So
-2x = 16.5 - 18

2x = 1.5
x = 0.75

Thus, 1 - x = 0.25
Hence, the percentage composition of these isotopes will be 75% and 25%, respectively.
Question 5
1 / -0

Isotope of which of the following elements is used in the treatment of cancer?

A
Iodine

B
Chlorine

C
Uranium

D
Cobalt

Solution

Isotope of cobalt is used in the treatment of cancer.
Question 6
1 / -0

What do you call the elements having fractional atomic masses?

A
Isotopes

B
Isobars

C
Isotones

D
Neutrons

Solution

The fractional atomic masses of elements are due to the existence of isotopes having different masses.
Question 7
1 / -0

Which of the following concepts was not considered in Rutherford's atomic model?

A
Electrical neutrality of atom

B
Quantization of energy

C
Electrons revolve around nucleus at very high speeds

D
Existence of nuclear forces of attraction on electrons

Solution

The concept of quantization of energy was not considered in Rutherford's atomic model.
Question 8
1 / -0

Who proposed nuclear model of atoms?

A
Niels Bohr

B
Thomson

C
Rutherford

D
James Chadwick

Solution

Nuclear model of atoms was perposed by Rutherford.
Question 9
1 / -0

The addition of a neutron to the nucleus of an atom results in

A
increase in nuclear charge

B
increase in atomic mass

C
formation of an isobar

D
none of these

Solution

The addition of a neutron to the nucleus of an atom results in increase in atomic mass.
Question 10
1 / -0

The nucleus of a chloride ion in comparison with that of a chlorine atom has

A
one more proton

B
one less proton

C
one more neutron

D
the same number of protons and neutrons

Solution

The nucleus of a chloride ion in comparison with that of a chlorine atom has the same number of protons and neutrons.

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Atomic Structure Test - 3

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Atomic Structure Test - 3

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SHARING IS CARING

Question 1

A chemical change involves rearrangement of atoms.

Atoms form ions by gain or loss of electrons.

The number of atoms may change when a substance changes from solid to gaseous state.

Total number of atoms during a chemical change remains unaltered.

Solution

Question 2

protons

neutrons

electrons

nucleus

Solution

Question 3

1 proton and 2 neutrons

1 proton

1 proton and 1 neutron

1 proton and 3 neutrons

Solution

Question 4

75%, 25%

35%, 65%

50%, 50%

33.33%, 66.67%

Solution

Question 5

Iodine

Chlorine

Uranium

Cobalt

Solution

Question 6

Isotopes

Isobars

Isotones

Neutrons

Solution

Question 7

Electrical neutrality of atom

Quantization of energy

Electrons revolve around nucleus at very high speeds

Existence of nuclear forces of attraction on electrons

Solution

Question 8

Niels Bohr

Thomson

Rutherford

James Chadwick

Solution

Question 9

increase in nuclear charge

increase in atomic mass

formation of an isobar

none of these

Solution

Question 10

one more proton

one less proton

one more neutron

the same number of protons and neutrons

Solution

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