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At the ground state, it is easier to fill the first energy level than the second because the second energy level is located farther away and takes more energy to get there.

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14y ago
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2w ago

Electrons fill the 1st energy level first because it has the lowest energy and is closest to the nucleus. Electrons are attracted to the positively charged nucleus and fill the energy levels in order of increasing distance from the nucleus.

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Q: Why do electrons start filling the 1st energy level of an atom before the 2nd?
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What energy level are the outermost electrons of vanadium?

The outermost electrons of vanadium are located in the 4s and 3d orbitals. These electrons generally occupy the 4s orbital before filling the 3d orbitals.


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The Aufbau principle states that in the ground state of an atom, electrons fill orbitals starting with the lowest energy level first. This principle allows us to predict the electron configuration of an atom by following the order of increasing energy levels.


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