If n = 3 we are in
1. K shell
2. L shell
3. M shell
4. F shell
In Rutherfords experiment ? particles were deflected because of
1.electrostatic repulsion between ? particles and positively charged part of atom
2. electrostatic repulsion between ? particles and positively charged part of atom
3. electrostatic repulsion between ? particles and positively charged part of atom
4. electrostatic attraction between ? particles and positively charged part of atom
Protium has
1. one neutron
2. two neutrons
3. no neutron
4. 3 neutrons
The electronic configuration is the arrangement of electrons in
1.nucleus
2.shells
3. sub-shells
4. all of above
When Uranium-238 emits ? particles it decays in to
1. Helium
2. Carbon
3. Thorium-234
4. Uranium-235
? particles are
1. positively charged
2.doubly positively charged
3.negatively charged
4.doubly negatively charged
According to Rutherford most of the space occupied by the atom is
1. filled
2. partially filled
3. empty
4. none of above
After 3s the sub-shell begin to fill is
1.3p
2.3d
3. 3f
4. 4s
Atoms having same atomic number but different atomic mass are called
1.derivatives
2. isotopes
3.elements
4.isomers
Chlorine-35 exists in nature about
1. 0.35
2. 0.4
3. 0.5
4. 0.75
D sub-shell can accommodate maximum
1. 2 electrons
2.10 electrons
3. 14 electrons
4. 6 electrons
Electron revolves around the nucleus in orbits which have
1.variable energy
2.fixed energy
3.infinite energy
4.zero energy
Electrons revolve only in those orbits with angular momentum as an
1. half integral multiple of h
2.integral multiple of h
3. integral multiple of h ? 2?
4. half integral multiple of 2?
Iodine-123 is used to
1.diagnose thyroid problem
2.image the brain
3.kill cancer cells
4.trace the blood flow
Rutherford bombarded thin gold foil with
1.? particles
2.? particles
3.? particles
4.neutrons
The energy of an electron in orbit is proportional to
1.distance between shells
2.distance from nucleus
3.distance between two nuclei
4.positive charge inside nucleus
The energy of emitted light is equal to
1.sum of energy levels
2.difference between energies of orbits
3.product of energies of orbits
4.none of above
The lowest energy orbital among the following is
1.3h
2.2p
3.3s
4.3p
Water that contains H-2 atoms is called
1.heavy water
2.light water
3.pure water
4.chlorinated water
When an electron jumps from lower orbit to higher orbit
1. light is emitted
2. electrons are emitted
3. electrons are absorbed
4. light is absorbed