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No. An orbital describes an energy level (a Fermi energy level) in which an electron may exist for a given atom. Just because an electron is not in that orbital does not mean one cannot go there. An easy example would be ionized neon gas in a lamp. The high voltage forces electrons into higher orbitals where they check in and then check out, dumping a photon as they leave. The orbitals existed before they were used. Orbitals are clearly defined for a given atom as the descrete energy levels into which electrons may shift if they gain a sufficient (an exact) quantity of energy to make the jump.

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What is the maximum number of electrons that can exist in 4f orbitals?

The maximum number of electrons that can exist in 4f orbitals is 14.-pg. 110 Modern Chemistry table 2:)


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Electrons are found in orbitals outside the nucleus of an atom.


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When both the electrons of s orbital are excited does that orbital exist?

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There are five d orbitals that can exist in a single subshell. These orbitals are usually labeled as dxy, dxz, dyz, dz^2, and dx^2-y^2. Each orbital can hold up to 2 electrons, giving a total of 10 electrons that can occupy the d subshell.


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Molecular orbitals: dihelium has two electrons in the bonding orbital and two in the antibonding orbital. That why it does not exists.


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