Electron configuration for phosphorus is 1s2 2s2 2p6 3s2 3p3. So the number of electron must be 15 , right ? But , what if m = 1 ? Does it effect the number of electron ?

The atomic number of P is 15 which means P has 15 protons; therefore, the number of electrons for a neutral P atom MUST be 15. m being 1 affects the energy level of one or more of the electrons (and of course the P atom) but it doesn't change the number of electrons from 15.

Ah, the mysterious electron! While m = 1 refers to the magnetic quantum number, it does not directly affect the number of electrons in an atom. The electron configuration of phosphorus remains the same regardless. So fear not, dear inquirer, the number of electrons in phosphorus remains a steady 15, unaffected by any quantum number antics!

In the electron configuration for phosphorus (P), the total number of electrons is indeed 15. However, the value of "m" refers to the magnetic quantum number, which represents the orientation of the electron's orbital. It does not affect the number of electrons.

The "m" value ranges from -l to +l, where "l" is the azimuthal quantum number. In the case of phosphorus, "m = 1" would mean that the electron is in a p orbital with an orientation of px. This does not alter the total number of electrons present, which remains 15.

The electron configuration for phosphorus is indeed 1s2 2s2 2p6 3s2 3p3, representing the distribution of electrons in its energy levels. According to this configuration, phosphorus has a total of 15 electrons.

As for your question about "m", it seems like you are referring to the magnetic quantum number (ml) which specifies the orientation of the orbital within a particular subshell. The "m" you mentioned, alone, does not affect the number of electrons. It is just a variable or a specific notation you are using.

In the case of phosphorus, the "m" value is not directly related to the number of electrons present in the atom. The "m" value depends on the specific orbitals within the subshell (like px, py, pz) to indicate the orientation of the electrons, rather than the number of electrons itself. So, m = 1 does not impact the number of electrons in phosphorus, which remains at 15.