If n = 3 we are in
1. K shell
2. L shell
3. M shell
4. F shell
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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
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Protium has
1. one neutron
2. two neutrons
3. no neutron
4. 3 neutrons
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The electronic configuration is the arrangement of electrons in
1.nucleus
2.shells
3. sub-shells
4. all of above
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When Uranium-238 emits ? particles it decays in to
1. Helium
2. Carbon
3. Thorium-234
4. Uranium-235
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? particles are
1. positively charged
2.doubly positively charged
3.negatively charged
4.doubly negatively charged
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According to Rutherford most of the space occupied by the atom is
1. filled
2. partially filled
3. empty
4. none of above
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After 3s the sub-shell begin to fill is
1.3p
2.3d
3. 3f
4. 4s
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Atoms having same atomic number but different atomic mass are called
1.derivatives
2. isotopes
3.elements
4.isomers
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Chlorine-35 exists in nature about
1. 0.35
2. 0.4
3. 0.5
4. 0.75
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D sub-shell can accommodate maximum
1. 2 electrons
2.10 electrons
3. 14 electrons
4. 6 electrons
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Electron revolves around the nucleus in orbits which have
1.variable energy
2.fixed energy
3.infinite energy
4.zero energy
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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?
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Iodine-123 is used to
1.diagnose thyroid problem
2.image the brain
3.kill cancer cells
4.trace the blood flow
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Rutherford bombarded thin gold foil with
1.? particles
2.? particles
3.? particles
4.neutrons
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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
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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
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The lowest energy orbital among the following is
1.3h
2.2p
3.3s
4.3p
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Water that contains H-2 atoms is called
1.heavy water
2.light water
3.pure water
4.chlorinated water
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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
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