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Q: What is the second quantum number of 2s2 electron in phosphorus?
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What is the third quantum number of a 3s2 electron in phosphorous 1s22s22p63s23p3?

Zero. First n=3; second l = 0; third m = 0.


How many quantum numbers?

n = 2, l = 0, ml = 0, ms = -1/2 Only the radial function R(r) of the Schrodinger wave function (psi) is needed to calculate the Energy. The radial function only deals with the principle quantum number (n). Therefore, only n is required to find the Energy. As to find the Energy states, one must specify if we are dealing with a one-electron atom situation or multiple-electron system. For one-electron atoms, the Energy states is determined by the principle quantum number (n). For multi-electron systems, the Energy states depend on both the principle quantum number (n) and orbital quantum number (l). This explanation is valid unless we are using very high resolution spectroscopic techniques, deviations will appear.


What does a quantum number describe?

n is the first quantum number. It is the principle quantum number. It refers to what energy level it is and will be one greater than the number of nodes in the orbital. l is the second quantum number. It is the angular momentum quantum number and refers to the shape of the orbital. ml is the third quantum number. It is the magnetic quantum number and it refers to the orientation of the orbital. ms is the fourth quantum number. It is the spin quantum number and refers to the magnetic character of the orbital.


How does Quantum number indicates the energy level an electron is found?

Quantum numbers relate to electrons in that they denote the electrons angular momentum. Angular momentum is a vector, so it has a magnitude (1/2) and a direction (+ or -). Each orbital in an atom can only hold 2 electrons, and each electron will have a +1/2 spin and a -1/2 spin.


How do you know how many electrons need to go in the second shell?

The formula is 2n2 where n is the principal quantum number (the "shell" number). In this case the second shell has a principal quantum number of 2 so 2X 22 = 8