The three correct rules or principles are the Aufbau Principle, Hund’s Rule, and the Pauli Exclusion Principle. Aufbau’s Principle states that each electron orbits the lowest energy orbital. It also states that all orbitals related to an energy level are of equal energy. Hund’s Rule states that single electrons with the same spin must occupy each equal-energy orbital before additional electrons with opposite spins can occupy the same orbitals. And finally, the Pauli Exclusion Principle states that a maximum of two electrons may occupy a single orbital, but only if the electrons have opposite spins. Hope this helps.
The three rules that define that how the electrons are arranged in atoms are the Aufbau Principle, Hund's rule, and the Pauli Exclusion Principle.
• According to the Aufbau Principle, each electron holds the lowest energy orbital, and all the orbitals associated with an energy level are of the same energy.
• According to Hund's rule, the single electrons with a similar spin must attain the equal energy orbital before the other electrons with the contrasting spins can attain similar orbitals.
• According to the Pauli Exclusion principle, only a maximum of up to two electrons can occur in a single orbital, and only if the electrons exhibit opposite spins.
Thus, the three rules, which illustrate that how the electrons are aligned in atoms are the Aufbau Principle, Hund's Rule, and the Pauli Exclusion Principle.
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