Structure of the Atoms Test

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Structure of the Atoms Test - 50

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has zero valency?

A
Sodium

B
Beryllium

C
Aluminium

D
Krypton

Solution

Noble Gases have zero valencies. Among the given options, only krypton is a noble gas.
Hence, Option "D" is the correct answer.
Question 2
1 / -0

Which of the following is always a whole number?

A
Atomic weight

B
Atomic radius

C
Atomic volume

D
Atomic number

Solution

Atomic weight is the mass of a single atom of an element. It may be fractional. Atomic radius (distance from an atom's nucleus to the outermost orbital of electrons) and atomic volume (average volume of one atom of an element) can be fractional as well.

Atomic number is the number of protons or electrons in an atom. Since this is countable, it's always a whole number. So, atomic number is the correct answer.
Question 3
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Who proved that atoms had a nucleus?

A
Ernest Rutherford

B
James Chadwick

C
J.J. Thomson

D
None of these
Question 4
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$$_{18} Ar^{40} , \ _{20} Ca^{40}$$ and $$_{19} K^{40}$$ are:

A
Isomers

B
Isotopes

C
Isobars

D
Isotones

Solution

Atoms of different elements having different atomic numbers but the same mass number are called isobars. In the given question, $$Ar$$, $$Ca$$, and $$K$$ all have the same mass number. Hence the correct option is C.
Question 5
1 / -0

Rutherford’s $$\alpha-$$ particle scattering experiment led to the discovery of;

A
Nucleus

B
Electrons

C
Atoms

D
Neutrons

Solution

Rutherfords alpha particle scattering experiment led to the discovery of nucleus.
Question 6
1 / -0

Goldsteins experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

A
Electron

B
Proton

C
Nucleus

D
Neutron

Solution

E. Goldstein in 1886 discovered the presence of new radiations in a gas discharge and called them canal rays. These rays were positively charged radiations which ultimately led to the discovery of another sub-atomic particle, called proton.
Correct option is $$B$$.
Question 7
1 / -0

The presence of electrons outside the nucleus and nucleus at the centre of the atom was suggested by:

A
Electrons by J.J. Thomson and nucleus by E. Goldstein

B
Electrons by J. Chadwick and nucleus by E. Rutherford

C
Electrons by J.J. Thomson and nucleus by E. Rutherford

D
Electrons by E. Rutherford and nucleus by J.J. Thomson

Solution

The presence of electrons outside the nucleus was suggested by J.J. Thomson and the presence of nucleus at the centre of the atom was suggested by E. Rutherford.
Hence the correct option is $$C$$.
Question 8
1 / -0

Which of the following statements about Rutherford’s model of atom are correct?
(i) Proposed that nearly all the mass of an atom resides in the nucleus.
(ii) Established that the $$\alpha$$–particles are four times as heavy as a hydrogen atom.
(iii) Considered the nucleus as positively charged.
(iv) Agreed with Thomson’s model.

A
(i) and (iii)

B
(ii) and (iii)

C
(i) and (iv)

D
only (i)

Solution

Based on his experiment, Rutherford put forward the nuclear model of an atom, which had the following features:
(i) There is a positively charged centre in an atom called the nucleus. Nearly all the mass of an atom resides in the nucleus.
(ii) The electrons revolve around the nucleus in circular paths.
(iii) The size of the nucleus is very small as compared to the size of the atom.
Question 9
1 / -0

Which of the following in figure do not represent Bohr’s model of an atom correctly?

A
(i) and (ii)

B
(ii) and (iii)

C
(ii) and (iv)

D
(i) and (iv)

Solution

According to Bohr's Model, the first shell cannot have more than 2 electrons and the second shell cannot have more than 8 electrons.
Hence correct option is (C).
Question 10
1 / -0

The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

A
mass number

B
atomic number

C
number of electrons

D
all of the above

Solution

The mass number refers to the sum of the number of protons and neutrons present in the nucleus of an atom and denoted by A.
Mass number = Number of protons + Number of neutrons.

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Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 50

Result

Structure of the Atoms Test - 50

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Rank

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SHARING IS CARING

Question 1

Sodium

Beryllium

Aluminium

Krypton

Solution

Question 2

Atomic weight

Atomic radius

Atomic volume

Atomic number

Solution

Question 3

Ernest Rutherford

James Chadwick

J.J. Thomson

None of these

Question 4

Isomers

Isotopes

Isobars

Isotones

Solution

Question 5

Nucleus

Electrons

Atoms

Neutrons

Solution

Question 6

Electron

Proton

Nucleus

Neutron

Solution

Question 7

Electrons by J.J. Thomson and nucleus by E. Goldstein

Electrons by J. Chadwick and nucleus by E. Rutherford

Electrons by J.J. Thomson and nucleus by E. Rutherford

Electrons by E. Rutherford and nucleus by J.J. Thomson

Solution

Question 8

(i) and (iii)

(ii) and (iii)

(i) and (iv)

only (i)

Solution

Question 9

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(i) and (iv)

Solution

Question 10

mass number

atomic number

number of electrons

all of the above

Solution

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