Class IX

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
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
D sub-shell can accommodate maximum
  1. 2 electrons
  2. 10 electrons
  3. 14 electrons
  4. 6 electrons
When Uranium-238 emits α particles it decays in to
  1. Helium
  2. Carbon
  3. Thorium-234
  4. Uranium-235
After 3s sub-shell begin to fill is
  1. 3p
  2. 3d
  3. 3f
  4. none of above
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