Atomic Structure Test

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Atomic Structure Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Isotopes of an element differ in their number of

A
electrons

B
protons

C
neutrons

D
all the above

Solution

Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom.
Question 2
1 / -0

Deuterium is a/an _____ of hydrogen.

A
isotope

B
isomer

C
compound

D
none of these

Solution

Deuterium is an isotope of hydrogen.
Question 3
1 / -0

When alpha particles are passed through a thin metal foil, only one out of thousands of particles is rebounded. This observation leads to the conclusion that

A
positively charged particles are concentrated at the centre of the atom and occupy very less space

B
a large number of electrons are revolving around the nucleus of the atom

C
a unit positive charge is only present inside an atom

D
a massive sphere with larger negative charge and unit positive charge is present at the centre of the atom

Solution

When alpha particles are sent through a thin metal foil, only one out of ten thousands of them is rebounded. This observation leads to the conclusion that positively charged particles are concentrated at the centre of the atom.
Question 4
1 / -0

Which among the following pairs of shells has least energy difference between two adjacent orbits?

A
K, L

B
L, M

C
M, N

D
N, O

Solution

N, O has the least energy difference as they are the outermost shells.
Question 5
1 / -0

The nucleus of hydrogen atom consists of

A
one neutron

B
one proton

C
one electron

D
one proton and one neutron

Solution

In hydrogen nucleus there is only one proton and no neutron.
Question 6
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Who discovered neutrons?

A
Thomson

B
Chadwick

C
Bohr

D
Rutherford

Solution

An atom comprises of three types of elementary particles called electrons, protons and neutrons. Neutron was discovered by a British Physicist named James Chadwick.
Question 7
1 / -0

Atoms of an element differ from atoms of all the other elements in

A
atomic number and electronic configuration

B
atomic number and number of valence electrons

C
number of neutrons and electronic configuration

D
number of neutrons and number of valence electrons

Solution

Atoms of an element differ from atoms of all the other elements in atomic number and electronic configuration only. The number of neutrons and valence electrons can be the same for two or more elements.
Question 8
1 / -0

For which of the following, only integers are possible?

I. Valency
II. Oxidation state
III. Atomic number
IV. Atomic weight

A
Both I, II and III

B
Both I, III and IV

C
Both I and III

D
Both III and IV

Solution

Valency, oxidation state and atomic number are always written as integers. But, atomic weight can be in decimals.
Question 9
1 / -0

What is the atomic number of an element that possesses 20 electrons in its N - orbital?

A
50

B
38

C
48

D
40

Solution

In N - orbital, there are 20 electrons. That means,
K-shell = 2 electrons
L-shell = 8 electrons
M-shell = 18 electrons
N-shell = 20 electrons
Total = 48 electrons

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Atomic Structure Test - 1

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Atomic Structure Test - 1

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Question 1

electrons

protons

neutrons

all the above

Solution

Question 2

isotope

isomer

compound

none of these

Solution

Question 3

positively charged particles are concentrated at the centre of the atom and occupy very less space

a large number of electrons are revolving around the nucleus of the atom

a unit positive charge is only present inside an atom

a massive sphere with larger negative charge and unit positive charge is present at the centre of the atom

Solution

Question 4

K, L

L, M

M, N

N, O

Solution

Question 5

one neutron

one proton

one electron

one proton and one neutron

Solution

Question 6

Thomson

Chadwick

Bohr

Rutherford

Solution

Question 7

atomic number and electronic configuration

atomic number and number of valence electrons

number of neutrons and electronic configuration

number of neutrons and number of valence electrons

Solution

Question 8

Both I, II and III

Both I, III and IV

Both I and III

Both III and IV

Solution

Question 9

50

38

48

40

Solution

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