An element 'm' has an atomic mass 27 and atomic number 13.How can its ion be represented ?
M3+
M2+
M+
M-
The fundamental particle which is responsible for keeping the nucleons together is
Electron
Proton
Positron
Meson
The wave length of the first line of Balmer series of hydrogen atom is 6561Ao. The wave length of the third line of the series is
2180 Ao
4339 Ao
13122 Ao
5865 Ao
Which one of the following does Bohr theory fails to explain ?
Stability of hydrogen
Line spectra of hydrogen atom
Line spectra of Li2+
Splitting of spectral lines in the presence of magnetic field
Which one has the same unit that of Planck's constant ?
Energy
Work
Angular momentum
Linear momentum
In hydrogen atom if energy of an electron in ground state is 13.6 ev, then that in the first excited state is __________________.
6.8 ev
1.51 ev
3.4 ev
13.6 ev
What is the orbital angular momentum of an electron in 3s orbital?
Zero
h/2π
√2 h/2π
None of these
In an atom with 2K, 8L and 13M electrons,what will be the total number of 'p' electrons ?
12
6
4
2
How many electrons will be present in the highest principal energy level of cobalt (z = 27) ?
7
9
1
Where does the cathode rays get deflected?
A magnetic field only
An electric field only
Both electric and magnetic field
