Structure of the Atoms Test

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Structure of the Atoms Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

Mass number of all elements represents number of ______________.

A
protons and neutrons

B
protons and electrons

C
electrons and neutrons

D
None of the above

Solution

The mass number (A), or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.
Question 2
1 / -0

In Rutherford's gold foil experiment:

A
very few $$\alpha$$-particles are deflected back.

B
most of $$\alpha$$-particles remain undeflected.

C
some of $$\alpha$$-particles deflected by small angles.

D
All of these
Question 3
1 / -0

Nuclides having the same difference in mass number and atomic number, are known as

A
isotones

B
isomers

C
isobars

D
isotopes

Solution

$$Number\ of\ neutrons = mass\ number - atomic\ number$$
Number of neutrons are equal to the difference in mass number and atomic number. And species having equal number of neutrons are known as isotone.
Question 4
1 / -0

The experiment which led to the discovery of nucleus was performed by :

A
Goldstein

B
J.J. Thomson

C
Dalton

D
Rutherford

Solution

Rutherford concluded in his scattering experiment that all the positive charge is concentrated in small fraction of total volume of atom in the nucleus.
Option D
Question 5
1 / -0

The atomic number of an element is $$11$$. Therefore the number of electrons in the M-shell of its atom is:

A
$$2$$

B
$$8$$

C
$$1$$

D
$$0$$

Solution

$$M$$ shell of an atom means 3rd shell (K, L, M).

The electronic configuration of an atom having atomic number $$11$$ is $$2, 8, 1$$ which shows that the third shell contains $$1$$ electron.

Hence, option C is correct.
Question 6
1 / -0

The number of electrons in the outermost orbit of the chlorine is

A
$$1$$

B
$$7$$

C
$$2$$

D
Not fixed

Solution

The electronic configuration of chlorine is $$2, 8, 7$$. It shows the outermost orbit contains $$7$$ electrons.
Question 7
1 / -0

The valence shell of calcium contains ___________.

A
$$2$$ electrons

B
$$4$$ electrons

C
$$6$$ electrons

D
$$8$$ electrons

Solution

The valency shell means the outermost shell or orbit of an element which has valence electrons or outer electrons in it. The atomic number of calcium is 20 and its electronic configuration is 2, 8, 8, 2 which shows that the outermost orbit or valency shell contains 2 electrons.
Question 8
1 / -0

$$_7N^{15}$$ and $$_8O^{16}$$ are a pair of :

A
isotopes

B
isobars

C
isotones

D
none of them

Solution

Two nuclides are isotones if they have the very same neutron number but different proton number.
Question 9
1 / -0

Beta particles are essentially:

A
neutrons

B
protons

C
electrons

D
helium nuclei

Solution

Beta particles are emitted when an element decays by radioactive $$\beta$$ decay. The particles are essentially $$[{ e }^{ - }]$$ electrons.
Question 10
1 / -0

The nuclear model of the atom was suggested by:

A
Bohr

B
Rutherford

C
Pauli

D
Mendeleef

Solution

Rutherford suggested highly charged centrally concentrated small volume called as atomic mass and this region is known as nucleus of atom and gave the nuclear model of atom.

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Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 33

Result

Structure of the Atoms Test - 33

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Question 1

protons and neutrons

protons and electrons

electrons and neutrons

None of the above

Solution

Question 2

very few $$\alpha$$-particles are deflected back.

most of $$\alpha$$-particles remain undeflected.

some of $$\alpha$$-particles deflected by small angles.

All of these

Question 3

isotones

isomers

isobars

isotopes

Solution

Question 4

Goldstein

J.J. Thomson

Dalton

Rutherford

Solution

Question 5

$$2$$

$$8$$

$$1$$

$$0$$

Solution

Question 6

$$1$$

$$7$$

$$2$$

Not fixed

Solution

Question 7

$$2$$ electrons

$$4$$ electrons

$$6$$ electrons

$$8$$ electrons

Solution

Question 8

isotopes

isobars

isotones

none of them

Solution

Question 9

neutrons

protons

electrons

helium nuclei

Solution

Question 10

Bohr

Rutherford

Pauli

Mendeleef

Solution

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