Atomic number indicates
No. of nutrones
No. of protons and electrons
No. of protons or electrons
No. of orbits
The smallest unit of an element is called
molecule
ion
atom
neucleus
The amu is defined as 1/12th of the mass of
Oxygen atom
Hydrogen atom
Carbon atom
Helium atom
1 MeV equals
1.6x10-13 J
1.6x10-23 J
2.42x1045 J
3.2x10-23 J
An elementary particle with a positive charge equal in magnitude to the electrons
neutron
protone
positron
neutrino
1 amu is equal to
9.8 MeV
931.5 Mev
9.31 Mev
93.1 MeV
Which among the following is true ?
A=Z+N
A=2Z
A=Z+2N
A= (Z+N)2
The mass-energy relation was proposed by
Thomson
Rutherford
Bohr
Einstein
Atom of an element is
positively charged
nutral
negatively charged
indivisible
If an α-particle is emitted, the atomic number of original nucleus
doubled by 2
reduced by 2
no change
halved
