Structure of Atom Test

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Structure of Atom Test - 17

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Question 1
1 / -0

The valence electrons of magnesium is different in ........... quantum number.

A
$$m$$

B
$$n$$

C
$$l$$

D
$$s$$

Solution

The configuration of magnesium is $$1s^2\ 2s^2\ 2p^6\ 3s^2$$.
The outermost electron is in s orbital and is paired.
Therefore, for the two electrons in 3s orbital, only s, spin quantum number is different.
Question 2
1 / -0

The atomic weight of an atom is because of

A
electrons and protons

B
electrons and neutrons

C
neutrons and protons

D
electrons, neutrons and protons

Solution

Atomic weight depends upon mass number, which is equal to sum of, number of protons and neutrons.
Question 3
1 / -0

Which of the following quantities can only be a whole number?

A
Atomic radius

B
Atomic number

C
Mass number

D
Equivalent weight

Solution

Atomic number of an element = number of protons = number of electrons and is always a whole number.
Question 4
1 / -0

For an atom of a given element, the number of electrons equals to:

A
the number of protons $$+$$ number of neutrons

B
the atomic number of the element

C
the number of proton $$-$$ number of neutrons

D
the mass number of the element

Solution

For an atom of a given element, the number of electrons are equal to the number of protons which is equal to atomic number of the element.
Question 5
1 / -0

According to Bohr hypothesis, discrete quantity is

A
Momentum

B
Angular velocity

C
Potential energy

D
Angular momentum

Solution

Bohr's hypothesis:
1) Electrons revolves round the nucleus in water orbits.
2) Orbit of the electron around the nucleus can take only some special values of radius.
3) The energy of the atom as a definite value in these orbits.
4) In this Orbits, Angular momentum (e) of the electron is integral multiple of the plank's constant h divided by $$2n$$ i.e. $$l = n \dfrac{h}{2n}$$.
Question 6
1 / -0

Bohr Magneton value in S.I. Units is:

A
$$9.273\times 10^{-24} erg T^{-1}$$

B
$$9.273\times 10^{-24} JT^{-1}$$

C
$$9.273\times 10^{-17} JT^{-1}$$

D
$$9.273\times 10^{-10} calT^{-1}$$

Solution

1 Bohr Magneton = $$9.273\times 10^{-24} JT^{-1}$$
Question 7
1 / -0

When the 3d orbital is complete, the new electron will enter in:

A
4p-orbital

B
4f orbital

C
4s orbital

D
4d-orbital

Solution

According to the Aufbau principle of electron filling in orbitals, the next shell to be filled after the $$ 3d $$ orbital is the $$ 4p $$ orbital.

Hence, the correct option is $$\text{A.}$$
Question 8
1 / -0

Bohrs atomic model assumes :

A
the nucleus is of infinite mass and is at rest

B
electron in a quantized orbit will not radiate energy

C
mass of the electron remains constant

D
all of the above

Solution

Bohr's Assumption :
( i ) Electron in atoms orbit the nucleus.
( ii ) Electron in a quantized orbit will not radiate energy.
( iii ) Electrons can only gain and lose energy by jumping from one allowed orbit to other.
He also assumed one of the postulates of Rutherford's atomic model, that is, the mass of the nucleus is very large compared to that of the electrons and hence assumed to be infinite
Question 9
1 / -0

The electrons are filled in various sub levels according to the order of their energies, is known as:

A
Aufbau principle

B
Pauli's principle

C
Hund's rule

D
$$nl^{x}$$ principle

Solution

The order of filling of orbitals from lower energy to higher energy is explained by the Aufbau's principle and the $$n+l$$ rule.
Question 10
1 / -0

The first model of an atom was given by _____________.

A
N. Bohr

B
E. Goldstein

C
Rutherford

D
J.J. Thomson

Solution

Sir J.J Thomson gave the first model of atom.
He by means of cathode-ray experiment discovered the existence of negatively charged particles in an atom which led to the discovery of electrons.
He gave the plum-pudding model of an atom in which electrons are embedded in atom-like currants.
Positive electrons are distributed all over the atom.
Hence, option (D) is correct.

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Structure of Atom Test - 17

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Structure of Atom Test - 17

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Question 1

$$m$$

$$n$$

$$l$$

$$s$$

Solution

Question 2

electrons and protons

electrons and neutrons

neutrons and protons

electrons, neutrons and protons

Solution

Question 3

Atomic radius

Atomic number

Mass number

Equivalent weight

Solution

Question 4

the number of protons $$+$$ number of neutrons

the atomic number of the element

the number of proton $$-$$ number of neutrons

the mass number of the element

Solution

Question 5

Momentum

Angular velocity

Potential energy

Angular momentum

Solution

Question 6

$$9.273\times 10^{-24} erg T^{-1}$$

$$9.273\times 10^{-24} JT^{-1}$$

$$9.273\times 10^{-17} JT^{-1}$$

$$9.273\times 10^{-10} calT^{-1}$$

Solution

Question 7

4p-orbital

4f orbital

4s orbital

4d-orbital

Solution

Question 8

the nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

mass of the electron remains constant

all of the above

Solution

Question 9

Aufbau principle

Pauli's principle

Hund's rule

$$nl^{x}$$ principle

Solution

Question 10

N. Bohr

E. Goldstein

Rutherford

J.J. Thomson

Solution

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