Solve
Study
Textbooks
Guides
Join / Login
>>
Class 11
>>
Chemistry
>>
Structure of Atom
>>
Discovery of Subatomic Particles
Discovery of Subatomic Particles
Revise with Concepts
Subatomic Particles - Electron
Example
Definitions
Formulaes
Subatomic Particles - Protons
Example
Definitions
Formulaes
Subatomic Particles - Neutrons
Example
Definitions
Formulaes
Atomic Theory of Matter
Example
Definitions
Formulaes
View more
Learn with Videos
History of Atomic Model
6 mins
Cathode rays experiment
13 mins
J.J. Thomson experiment for determination of charge to mass ratio
13 mins
R.A.Millikan experiment for discovery of the charge on electron
18 mins
Discovery of proton and it's postulates
18 mins
Properties of anode or canal rays
4 mins
Discovery of neutron and it's postulates
14 mins
Quick Summary With Stories
History of Atoms and Molecules
3 mins read
Dalton's Atomic Theory
3 mins read
Cathode Rays
3 mins read
Important Questions
Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?
Medium
View solution
>
What are canal rays?
Easy
View solution
>
On the basis of Thomson's model of an atom, explain how the atom is neutral as a whole?
Medium
View solution
>
(i) Calculate the number of electrons which will together weighs one gram.
(ii) Calculate the mass and charge of one mole of electrons.
Medium
View solution
>
Which of the following statements is not correct about the characteristics of cathode rays?
Medium
View solution
>
Which of the following is not a postulate of Dalton's atomic theory?
Medium
View solution
>
The increasing order for the values of
e
/
m
(charge/mass) for electron (
e
), proton (
p
), neutron (
n
) and alpha particle (
α
) is:
Medium
View solution
>
Fill in the blanks in the following statements:
(a) The number of protons in the nucleus of an atom is called its ______.
(b) The total number of protons and neutrons in the nucleus of an atom is called ______.
(c) An atom has atomic mass number 23 and atomic number 11. The atom has ______ electrons.
(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ___________.
(e) If the nucleus of an atom has atomic number 17 , mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ______.
(f) Almost all the mass of an atom is concentrated in a small region of space called the ______.
(g) Cathode rays are a beam of fast moving ______.
(h) The anode rays obtained from hydrogen gas consist of particles called ______.
(i) The maximum number of electrons that can be accommodated in L shell are ______.
(j) The maximum number of electrons that can go into the M shell is ______.
(k) The subatomic particle not present in a hydrogen atom is ______.
(l) The electron has ______ charge, the proton has ______ charge, and the neutron has ______ charge.
Medium
View solution
>
Which of the following statements about the electron is incorrect?
Medium
View solution
>
An oil drop of 12 excess electrons is held stationary under a constant electric field of
2
.
5
5
×
1
0
4
N
C
−
1
in Millikans oil drop experiment. The density of the oil is
1
.
2
6
g
c
m
−
3
. Estimate the radius of the drop. [g =
9
.
8
m
s
−
2
;
e
=
1.60
×
1
0
−
1
9
C].
Hard
View solution
>