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In s.p.d.f. notation, the first number is the main energy level (quantum shell), also known as n. In this case, n = 4, hence this is the 4th energy level we are talking about.

The letter in the middle is the orbital in that energy level. There are s-orbitals, p-orbitals, d-orbitals and f-orbitals. Here we are talking about the p-orbitals of the 4th main energy level (i.e. the dumbbell shaped orbitals).

The final number of the notation is the number of electrons occupying that orbital of that energy level. All s-orbitals can only hold up to 2 electrons, p-orbitals can hold up to 6 electrons, d-orbitals up to 10, and so on. The 3 in "4p3" is hence referring to the 3 electrons in the p-orbital of the 4th energy level.

I hope that helps! :)

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11y ago
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15y ago

The principle energy level The principle energy level

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Q: What does the 3 in the exuation 4p3 represent?
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