Structure of Atom
Maharashtra Board · Class 11 · Chemistry
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Quick Quiz: Structure of Atom
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Which subatomic particle has negligible mass compared to proton and neutron?
What is the atomic number of an element with 17 protons and 18 neutrons?
According to Bohr's model, electrons revolve around the nucleus in:
The energy of electromagnetic radiation is given by the equation E = hν. What does 'h' represent?
Sample Questions
Which of the following are isotopes of carbon? (Select all correct answers)
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¹²C, ¹³C, ¹⁴C
Isotopes are atoms of the same element with different mass numbers. ¹²C, ¹³C, and ¹⁴C all have 6 protons but different numbers of neutrons. ¹⁴N has 7 protons, so it's nitrogen, not carbon.
What is the maximum number of electrons that can be accommodated in the M shell (n=3)?
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18
The maximum number of electrons in a shell is given by 2n². For M shell (n=3), maximum electrons = 2 × 3² = 2 × 9 = 18 electrons.
Which of the following quantum numbers determine the energy of an orbital in multi-electron atoms? (Select all correct answers)
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Principal quantum number (n), Azimuthal quantum number (l)
In multi-electron atoms, orbital energy depends on both n and l quantum numbers due to electron-electron repulsions. The (n+l) rule is used to determine energy order.
According to Hund's rule, electrons in degenerate orbitals:
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Occupy orbitals singly before pairing
Hund's rule states that electrons occupy degenerate orbitals singly first, with parallel spins, before pairing begins. This minimizes electron-electron repulsion.
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