Structure of the Atoms Test

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Structure of the Atoms Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

The approximate radius of polonium nucleus of mass number 210 is:

A
$$7.72 \times 10^{-15}\ m$$

B
$$7.72 \times 10^{-14}\ m$$

C
$$4\times 10^{-9}\ m$$

D
$$4\times 10^{-12}\ m$$

Solution

Radius of nucleus can be estimated by,
$$R = 1.3 \times 10^{-13} \times A^{\frac{1}{3}}$$

Where A is the mass number.
$$\therefore R=1.3 \times10^{-13}\times (210)^{\frac{1}{3}}$$

$$= 7.72\times 10^{-15} \ m$$
Hence, option $$A$$ is correct.
Question 2
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Which of the following gave the idea of nucleus of the atom?

A
Oil drop experiment

B
Davisson and Germer's experiment

C
$$\alpha$$-ray scattering experiment

D
Austen's mass spectrogram experiment

Solution

RUTHERFORD's SCATTERING EXPERIMENT:
According to this, there is an empty space around the nucleus called extra nuclear part. In this part electrons are present. The no. of electrons in an atom is always equal to no. of protons present in the nucleus. As the nuclear part of atom is responsible for the mass of the atom, the extra nuclear part is responsible for its volume.
Question 3
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The ratio of the radii of the atom to the nucleus is :

A
$$10^5\, :\, 1$$

B
$$10^{-4}\, :\, 1$$

C
$$10^{2}\, :\, 1$$

D
$$10^4\, :\, 1$$

Solution

Rutherford, based on the data collected from the $$\alpha$$ - particle scattering experiment, estimated that the radius of the nucleus is about $$10^5$$ times less than the radius of the atom.
Question 4
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Bohr's atomic model can explain the spectrum of:

A
hydrogen atoms only

B
atoms or ions which are unielectron

C
atoms or ions which have only two electrons

D
hydrogen molecule

Solution

Bohr's atomic model can explain the spectrum of atoms or ions which are uni-electron. It cannot explain the spectrum of the multi-electron system.
Question 5
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The particles present in the nucleus of an atom are :

A
the proton and the electron

B
the electron and the neutron

C
the proton and the neutron

D
Only neutrons

Solution

The particles present in the nucleus of an atom are the proton and the neutron. Electrons are revolving around the nucleus in circular orbits.

Option $$C$$ is correct.
Question 6
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The nucleus of an atom contains

A
Electrons and protons

B
Protons and neutrons

C
Electrons and neutrons

D
Electrons, protons and neutrons

Solution

The atom consists of a tiny nucleus surrounded by moving electrons. The nucleus contains protons, which have a positive charge equal in magnitude to the electron's negative charge. The nucleus may also contain neutrons, which have virtually the same mass but no charge.
Question 7
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Which statement about atom is incorrect?

A
Atoms are invisible

B
All atoms have same number of protons and electrons

C
Atoms are made up of subatomic particles

D
It has mass
Solution
Atoms are smallest particle of an element.
They consists of solid mass in the center known as the nucleus in which protons and neutrons are present.
Outside the nucleus, there are present electrons which keep up on revolving around it.
Thus the atom is not mostly the empty space.
Hence this statement is $$False$$.
Question 8
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Most of the mass of an atom is concentrated in a small region of space called the ..............

A
nucleus

B
neutron

C
proton

D
electron

Solution

Atom is made of particles called electrons, neutrons, and protons. Electrons have negligible mass and hence do not contribute much to the mass of an atom. Protons and neutrons contribute to the mass of an atom and are present in a small region called the nucleus. Hence option A is correct.
Question 9
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Atomic number (Z) = Number of ......... = Number of ..............(for neutral atom)

A
protons, electrons

B
electrons, neutrons

C
protons, neutrons

D
nucleus, protons

Solution

Atomic number is the number of protons in an atom. In a neutral atom, the number of protons is always equal to number of electrons. So, atomic number is not just equal to number of protons but also number of electrons in a neutral atom.

Atomic number (Z) = Number of protons = Number of electrons
Question 10
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............... of an element are the atoms of same element having same atomic number but different mass number.

A
Isotope

B
Isobar

C
Isotone

D
Isoelectron

Solution

Isotopes are atoms that have the same atomic number but different mass numbers.

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Structure of the Atoms Test - 30

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Structure of the Atoms Test - 30

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Question 1

$$7.72 \times 10^{-15}\ m$$

$$7.72 \times 10^{-14}\ m$$

$$4\times 10^{-9}\ m$$

$$4\times 10^{-12}\ m$$

Solution

Question 2

Oil drop experiment

Davisson and Germer's experiment

$$\alpha$$-ray scattering experiment

Austen's mass spectrogram experiment

Solution

Question 3

$$10^5\, :\, 1$$

$$10^{-4}\, :\, 1$$

$$10^{2}\, :\, 1$$

$$10^4\, :\, 1$$

Solution

Question 4

hydrogen atoms only

atoms or ions which are unielectron

atoms or ions which have only two electrons

hydrogen molecule

Solution

Question 5

the proton and the electron

the electron and the neutron

the proton and the neutron

Only neutrons

Solution

Question 6

Electrons and protons

Protons and neutrons

Electrons and neutrons

Electrons, protons and neutrons

Solution

Question 7

Atoms are invisible

All atoms have same number of protons and electrons

Atoms are made up of subatomic particles

It has mass

Solution

Question 8

nucleus

neutron

proton

electron

Solution

Question 9

protons, electrons

electrons, neutrons

protons, neutrons

nucleus, protons

Solution

Question 10

Isotope

Isobar

Isotone

Isoelectron

Solution

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