The lowest energy orbital among the following is

  • 2s
  • 2p
  • 3s
  • 3p

When Uranium-238 emits α particles it decays in to

  • Helium
  • Carbon
  • Thorium-234
  • Uranium-235

D sub-shell can accommodate maximum

  • 2 electrons
  • 10 electrons
  • 14 electrons
  • 6 electrons

Chlorine-35 exists in nature about

  • 0.35
  • 0.4
  • 0.5
  • 0.75

Protium has

  • one neutron
  • two neutrons
  • no neutron
  • 3 neutrons

According to Rutherford, most of the space occupied by the atom is

  • filled
  • partially filled
  • empty
  • none of above

The electronic configuration is the arrangement of electrons in

  • nucleus
  • shells
  • sub-shells
  • all of above

α particles are

  • positively charged
  • doubly positively charged
  • negatively charged
  • doubly negatively charged

The energy of emitted light is equal to

  • sum of energy levels
  • difference between energies of orbits
  • product of energies of orbits
  • none of above

Electrons revolve only in those orbits with angular momentum as an

  • half integral multiple of 'h'
  • integral multiple of 'h'
  • integral multiple of h ⁄ 2π
  • half integral multiple of 2π

After 3s the sub-shell begin to fill is

  • 3p
  • 3d
  • 3f
  • 4s

When an electron jumps from lower orbit to higher orbit

  • light is emitted
  • electrons are emitted
  • electrons are absorbed
  • light is absorbed

Atoms having same atomic number but different atomic mass are called

  • derivatives
  • isotopes
  • elements
  • isomers

Rutherford bombarded thin gold foil with

  • α particles
  • β particles
  • γ particles
  • neutrons

Iodine-123 is used to

  • diagnose thyroid problem
  • image the brain
  • kill cancer cells
  • trace the blood flow

If n = 3 we are in

  • K shell
  • L shell
  • M shell
  • F shell

Water that contains H-2 atoms is called

  • heavy water
  • light water
  • pure water
  • chlorinated water

Electron revolves around the nucleus in orbits which have

  • variable energy
  • fixed energy
  • infinite energy
  • zero energy

In Rutherford's experiment, α particles were deflected because of

  • electrostatic repulsion between α particles and positively charged part of atom
  • electrostatic attraction between α particles and positively charged part of atom
  • electrostatic repulsion between β particles and positively charged part of atom
  • electrostatic attraction between γ particles and positively charged part of atom

The energy of an electron in orbit is proportional to

  • distance between shells
  • distance from nucleus
  • distance between two nuclei
  • positive charge inside nucleus
0 h : 0 m : 1 s

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