Test: Structure Of Atom - 5


25 Questions MCQ Test NCERT Textbooks (Class 6 to Class 12) | Test: Structure Of Atom - 5


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QUESTION: 1

The first use of quantum theory to explain the structure of atom was made by –

Solution: Bohr first made use of quantum theory to explain the structure of atom and proposed that energy of electron in an atom is quantized
QUESTION: 2

Plum-Pulding model is known as–

Solution:

Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.

QUESTION: 3

Nucleous consist of–

Solution:
QUESTION: 4

The number of valence electron in Na is –

Solution:
QUESTION: 5

Mass number of element is –

Solution:
QUESTION: 6

According to the Dalton's atomic theory –

Solution:
QUESTION: 7

Neutron is a fundamental particle which have–

Solution:
QUESTION: 8

No. of unpaired electron in 1s2.2s2.2p4

Solution:
QUESTION: 9

The electron should be filled in the orbital in accordance with the increasing order of their energy. This statement
is related with

Solution:

This statement is related with Aufbau principle.
According to Aufbau principle (also known as (n+l) rule), electrons are filled in different orbitals from lower (n+l) value orbital to higher (n+l) value orbital.
In case (n+l) value is same, electron is filled first in orbital with lower value of n.

QUESTION: 10

Which species does not contain neutron –

Solution:
QUESTION: 11

In an atom, the mass number of an atom is equal to the number of___________.

Solution:
QUESTION: 12

Atomic number of any element–

Solution:
QUESTION: 13

Lighest particle is –

Solution:
QUESTION: 14

Fundamental particle of atomic nucleus is–

Solution:
QUESTION: 15

The atomic size of atom is nearly –

Solution:
QUESTION: 16

An atom which has a mass number of 14 or 8 neutrons is–

Solution:

Isotopes are the atoms of the same element with similar atomic number but different atomic mass.The elements of isotopes share same chemical properties but different physical properties

QUESTION: 17

Electronic configuration of p in ground state is –

Solution:
QUESTION: 18

When a gas at reduced pressure is subjected to an electric discharge, the rays orignating from the negative electrode are–

Solution:
QUESTION: 19

The maximum number of electrons that can be accomodate in the nth level is–

Solution:
QUESTION: 20

Isotopes of an element are the atom which have –

Solution:
QUESTION: 21

The nucleus of an atom contains:

Solution:
QUESTION: 22

What is the no. of electrons in Argon?

Solution:

The no. of electrons is the atomic number of an element.

QUESTION: 23

The isotope deuterium of hydrogen has

Solution:
QUESTION: 24

The no. of electrons in the valence shells of Sodium and Calcium repectively:

Solution:

Electronic configuration of

Na is 2, 8, 1

Ca is 2, 8, 8, 2

QUESTION: 25

The maximum number of electrons that can be accommodated in third shell ( n = 3) is:

Solution:

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