Structure of Atom Test

Result

Structure of Atom Test - 24

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Weekly Quiz Competition

Question 1
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In which of the following autfnau principle is violated ?

A

B

C

D

Solution

A) The option is not following Aufbau's principle.
Explanation:
According to Aufbau's principle electrons should be filled in the following orders : $$1s < 2s < 2p < 3s < 3p$$ ......
In case of an option, A filling of $$2p$$ orbitals is done before completely filling the 2s orbitals that are only 1 electron is filled in $$2s$$ which has a capacity of 2 electrons
Question 2
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The number of neutrons in the dispositive zinc ion is: (mass number of Zn=65)

A
35

B
33

C
65

D
67

Solution
Question 3
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How many electrons can fit in the orbital for which:
$$n=3$$ and $$l=1$$?

A
10

B
14

C
2

D
6

Solution
Question 4
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The first model of an atom is given by:

A
Neils Bohr

B
Ernest Rutherford

C
J.J. Thomson

D
Eugen Goldstein

Solution

$$J.J.\ Thomson$$ gave the first model of an atom.
Question 5
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Atomic number of elements represent

A
Number of protons in the nucleus

B
Number of neutrons in the nucleus

C
Number of protons an neutrons in the nucleus

D
The valency of an element

Solution

Atomic number is the number of protons in nucleus of an atom.
Question 6
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The atomic number of an element is derived from

A
Number of electrons

B
Number of protons

C
Number of neutrons

D
Number of isotopes

E
Number of nucleons

Solution

The atomic number is number of protons in the nucleus of an atom.
Question 7
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Mosley's name is most closely associated with the discovery of

A
Positron

B
Deutrons

C
Atomic number

D
Atomic weight

Solution

Correct option is C.
Question 8
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What is the nucleon number of an atom?

A
The number of neutrons

B
The number of protons

C
The total number of protons and neutrons

D
The total number of protons and electrons

Solution

Solution:- (C) The total number of protons and neutrons
The nucleon number or mass number of an atom, is the total number of protons and neutrons in an atomic nucleus.
Question 9
1 / -0

The electronic configuration of an element is $$1s^{2} 2s^{2} 2p^{3}$$. The number of unpaired electron in this atom are

A
$$3$$

B
$$5$$

C
$$7$$

D
$$1$$

Solution
Question 10
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Which of the following is the correct electronic configuration of scandium (atomic number = $$21$$) ?

A
$$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{3} $$

B
$$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{1} 4s^{2} $$

C
$$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{2} 4s^{1} $$

D
$$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 4p^{1} $$

Solution