Structure of Atom Test

Result

Structure of Atom Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Who was the first scientist to propose a model for the structure of an atom?

A
J.J. Thomson

B
Dalton

C
Ernest Rutherford

D
E. Goldstein

Solution

J.J. Thomson was the first one to propose a model for the structure of an atom.
Question 2
1 / -0

The chromium atom is represented as :

A
Cr$$_{24}^{50}$$

B
Cr$$_{24}^{52}$$

C
Cr$$_{52}^{24}$$

D
Cr$$_{50}^{24}$$

Solution

The Chromium atom has atomic number $$Z=(24)$$ and atomic mass $$A=(52)$$. Therefore, it is represented as $$M_z^A= Cr_{24}^{52}$$
Question 3
1 / -0

The atomic number of an element is determined by:

A
the number of electrons in one atom

B
the number of neutrons in one atom

C
the valency of the element

D
the number of protons in one atom

Solution

Atomic number is the number of protons in the nucleus of an atom and also the total positive charge in the atomic nucleus.

Hence, option $$D$$ is correct.
Question 4
1 / -0

Bohr proposed his atomic model based on :

A
oil drop experiment

B
planck's quantum theory

C
$$\alpha$$-ray scattering experiment

D
experiments on conduction of gases

Solution

Bohr proposed his atomic model based on planck's quantum theory.
Question 5
1 / -0

Thomson proposed the model of an atom similar to :

A
christmas tree

B
christmas pudding

C
chocolate

D
none of the above

Solution

Thomson proposed the model of an atom be similar to that of a Christmas pudding. The electrons in a sphere of positive charge were like currants (dry fruits) in a spherical Christmas pudding.
Question 6
1 / -0

While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called ________.

A
isotope

B
isobars

C
nucleus

D
energy levels

Solution

While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called energy levels.
Question 7
1 / -0

Atomic number is given by the number of _____ of an atom.

A
neutrons

B
electrons

C
protons

D
All of the above

Solution

It is the number of protons of an atom, which determines its atomic number.
Question 8
1 / -0

______ is defined as the number of protons & neutrons present in the nucleus of an atom.

A
Atomic number

B
Mass number

C
Atomic mass number

D
None of these

Solution

Mass number is defined as the number of protons and neutrons present in the nucleus of an atom and it is denoted by "A".

Hence the correct option is B.
Question 9
1 / -0

All the atoms of same element have same _______.

A
mass number

B
atomic number

C
atomic mass

D
All of the above

Solution

All the atoms of the same element have same atomic number.
Question 10
1 / -0

Which of these have the same chemical properties, but their physical properties may be different?

A
Atomic number

B
Mass number

C
Isotopes

D
Isobars

Solution

Isotopes have same chemical properties, but their physical properties might be different.

Chemical properties of an element depend on its atomic number or number of protons. Isotopes of an element have the same atomic number, hence their chemical properties are the same. But their physical properties may vary.

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Structure of Atom Test - 19

Result

Structure of Atom Test - 19

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Question 1

J.J. Thomson

Dalton

Ernest Rutherford

E. Goldstein

Solution

Question 2

Cr$$_{24}^{50}$$

Cr$$_{24}^{52}$$

Cr$$_{52}^{24}$$

Cr$$_{50}^{24}$$

Solution

Question 3

the number of electrons in one atom

the number of neutrons in one atom

the valency of the element

the number of protons in one atom

Solution

Question 4

oil drop experiment

planck's quantum theory

$$\alpha$$-ray scattering experiment

experiments on conduction of gases

Solution

Question 5

christmas tree

christmas pudding

chocolate

none of the above

Solution

Question 6

isotope

isobars

nucleus

energy levels

Solution

Question 7

neutrons

electrons

protons

All of the above

Solution

Question 8

Atomic number

Mass number

Atomic mass number

None of these

Solution

Question 9

mass number

atomic number

atomic mass

All of the above

Solution

Question 10

Atomic number

Mass number

Isotopes

Isobars

Solution

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