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Question

Which of the following rules says the electrons would go first to lower energy levels and then to the higher energy levels?

A
Aufbau Principle
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B
Pauli's Exclusion Principle
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C
Hund's Rule
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D
Heisenberg's Uncertainty Principle
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Solution

The correct option is A Aufbau Principle
According to Aufbau principle, in the ground state of atoms the orbitals are filled in order of increasing energies based on (n + l) rule i.e. from lower energy levels to higher energy levels.

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