Veto q&a 7 Month22 (1)

@alchemist
2018
April
neutron
Q
Q
Who discovered Neutrons
A. James chadwick
Q&A Bonus
mass of neutron = 1.6749x10 -27 Kg
Heaviest particle in an atom
A. neutron
• neutron is chargeless in nature. When a neutron
splits, an electron and a proton are obtained.
neutron is the least stable particle in an atom
• Protons and Neutrons together stay inside the
nucleus. Therefore they are known as nucleons
• atomic number & mass number
atomic number (Z)
Number of electrons or protons present in an atom
mass number (a)
Sum of number of nucleons in an atom.
Representation of Element = X A
Z
Where X = Element
atomic Species
• Elements with same atomic number and
different mass number - isotopes
• Elements with same mass number and different
atomic number - isobars
• Elements or atoms with same number of
neutrons - isotones
Q
Who proposed the idea of isotopes
A. Frederic Soddy
Q
Q
Q
Q&a Quick Revision
Most abundant Hydrogen isotope in the Universe
A. Proteum (93%)
Which Hydrogen Isotope is known as ‘Heavy
Hydrogen’
A. Deuterium
Radio active isotope of Hydrogen
A. tritium
electron Proton neutron
negatively charged Positively charged chargeless
Discovered by
J.J. thomson
Discovered by
ernest Rutherford
atom models
Q
Q
Q
Q
Q
First atom model
A. Plum pudding model (Water melon
model)
Who proposed plum-pudding model
A. J.J.thomson
Who proposed the planetory Model of atom
A. ernest Rutherford
First successful atom model
A. Bohr model
Popular atom Model
A. Bohr model
Shells and Subshells
Q
Q
Q
Discovered by James chadwick
lightest Particle Heaviest Particle
charge=-1.6 x10 -19 c charge=+1.6x10 -19 c least stable particle
mass = 9.1x10 -31 kg mass = 1.6x10 -27 Kg
when a neutron splits, electron
and proton are formed
The energy levels around the nucleus in which
electrons revolve are called
A. Shell or orbit
The 3-Dimensional Space inside nucleus where
there is probability of finding electrons
A. Subshell or orbital
Maximum number of electrons occupied in each
shell is according to the equation
A. 2n 2 , where ‘n’ represents the shell
Widow remarriage association was founded by - vishnu Sasthri Pandit 51