α-Particles can be detected using
thin aluminium sheet
barium sulphate
zinc sulphide screen
gold foil
How many neutrons are there in nucleus 'X', if it gives 7N14 after two successive - particle emissions ?
7
10
14
09
According to Bohr, the angular momentum of an electron, in any orbit, should be :
h/2
nh/2
h/mv
2/nh
Quantum numbers of an atom can be defined on the basis of :
Hund's rule
Pauli's exclusion principle
Aufbau's principle
Heisenberg's uncertainty principle
B.
Pauli's exclusion principle
Each electron in an atom is designated by a set of four quantum numbers. According to Pauli's exclusion principle, no two electron in an atom have same values ofall the four quantum numbers. Therefore consequently, an orbital accommodates two electrons with opposite spins, these two electrons have the me value of quantum number 'n' , 'l' and 'm' but value of 's' will be different.