The fundamental particle which is responsible for keeping the nucleons together is
Electron
Proton
Positron
Meson
How many electrons will be present in the highest principal energy level of cobalt (z = 27) ?
2
7
9
1
Which theory observed that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration ?
Heisenberg's uncertainty principle
Pauli's exclusion principle
Aufbau principle
Hund's rule of maximum multiplicity
The ground state of an atom means that all the electrons are?
Having the same energy
In the lowest possible energy state
In the first orbit
In the nucleus
If λ1 and λ2 are the wave lengths of characteristic X - ray and gamma rays respectively then what is the relation between them ?
λ1 = λ2
λ1 > λ2
λ1 = 1/λ2
λ1 < λ2
In an atom with 2K, 8L and 13M electrons,what will be the total number of 'p' electrons ?
12
6
4
What is the number of electrons in K19 which have n = 3 and l = 1 ?
8
What is the ratio of the radii of the 2nd and 3rd Bohr orbits in hydrogen atom ?
3:8
3:4
9:16
4:9
What is the ratio between the energy of a photon of 1500 Ao wave length radiation to that of 3000 Ao wave length radiation ?
1/4
1/2
Where does the cathode rays get deflected?
A magnetic field only
An electric field only
Both electric and magnetic field
None of these
