Electronic Structure of the Atom: MCQ1
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Questions and Answers

What is the definition of an energy level in an atom?

  • A region of infinite energy within an atom that electrons can occupy
  • A region of definite energy within an atom that electrons can occupy (correct)
  • A region of definite energy within an atom that electrons cannot occupy
  • A region of zero energy within an atom that electrons cannot occupy

What is the purpose of a spectroscope?

  • To show the characteristic line spectrum of a mixture
  • To show the characteristic line spectrum of an element (correct)
  • To show the characteristic line spectrum of a solution
  • To show the characteristic line spectrum of a compound

What type of spectrum shows dark lines at specific wavelengths depending on the elements present?

  • Continuous Spectrum
  • Absorption Spectrum (correct)
  • Transmission Spectrum
  • Emission Spectrum

According to Niels Bohr's theory, what happens when an electron moves from a higher energy level to a lower energy level?

<p>A definite amount of energy is emitted in the form of light (D)</p> Signup and view all the answers

What is the formula to calculate the difference in energy levels?

<p>E2 - E1 = hf (B)</p> Signup and view all the answers

What series is associated with excited electrons falling back to n=2?

<p>Balmer series (B)</p> Signup and view all the answers

What is used to measure the presence and amount of an element?

<p>Atomic Absorption Spectrometer (D)</p> Signup and view all the answers

What colour flame is produced when barium is burned in a flame test?

<p>Yellow / green (B)</p> Signup and view all the answers

What is the primary limitation of the Bohr theory?

<p>It only worked well for hydrogen (D)</p> Signup and view all the answers

What is the Heisenberg uncertainty principle?

<p>It is not possible to determine the exact position and velocity of an electron at the same time (A)</p> Signup and view all the answers

What is the region around the nucleus where the probability of finding an electron is relatively high?

<p>Atomic orbital (B)</p> Signup and view all the answers

What is the Aufbau principle?

<p>Electrons will occupy the lowest sublevel available (C)</p> Signup and view all the answers

What are energy levels?

<p>Regions of definite energy within an atom that electrons can occupy (D)</p> Signup and view all the answers

What is an energy sublevel?

<p>A group of atomic orbitals all of the same energy (D)</p> Signup and view all the answers

What is the primary reason why the Bohr theory did not account for the existence of orbitals?

<p>It did not take into account the wave-particle duality of electrons (C)</p> Signup and view all the answers

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