Structure of Atom — Important Questions
Maharashtra Board · Class 11 · Chemistry
45 important questions from Structure of Atom for Maharashtra Board Class 11 Chemistry, with answers. Includes multiple choice and multiple correct.
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Important Questions from Structure of Atom
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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