Veto q&a 7 Month22 (1)

2018
April
Q & A
@alchemist
asst
toP geaR
Periodic table - outline, Structure
Q
Q
Q
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atom - Fundamentals
First theory associated with atom
A. atomic theory by John Dalton
Who discovered atom
A. John Dalton
Who coined the term, ‘atom’
A. ostwald (the word ‘atom’ was
also coined by ancient greek Philosophers
leucippus and Democritus)
Central Part of an atom
A. nucleus
• Nucleus was discovered by Ernest Rutherford
in 1911 based on 1909 - Geiger - Marsden
gold Foil Experiment
Q
Charge of an Atom
A. atom is chargeless
• Atom contains equal number of electrons and
protons
electron
Q
Q
Q
identity card of an element
atomic Particles
Who discovered electrons
A. J.J. thomson (by cathode Ray
Discharge tube experiment)
Who coined the term ‘electron’
A. george Johnstone Stoney
‘Charge of electron’ was discovered by
A. millikan (oil Drop experiment )
⎛ e ⎞
Q ‘Charge to Mass’ ⎜ ⎟ratio of electron was
⎝m
⎠
discovered by
A. J.J. thomson
Q
charge of electron = -1.6 x10 -19 c
mass of electron = 9.1x10 -31 kg
charge to mass ratio of electron = -1.76x 10 11 c/Kg
Mass of electron, was discovered by
A. J.J. thomson
• electron shows particle nature as well as wave
nature
Q
Q
Proton
Q
Q
Q
Q
The dual nature of electrons was proposed by
A. louis de Broglie
The dual nature of electrons, experimentally
proved by
A. Davisson & germer
Who discovered the presence of positive charge
in an atom
A. goldsein (by Discharge tube
experiment)
Particle known as Anode Ray or Canal Ray
A. Proton
charge of Proton = +1.6x10 -19 c
mass of proton = 1.6x10 -27 Kg
Who discovered protons
A. ernest Rutherford
Particle known as the ‘Identity Card of an element’
A. Proton
Deepika
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