The total number of electrons in Phosphorus (P) is 15 (its atomic number). The first energy level contains 2, the second energy level contains 8, and the third energy level contains 5.
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Sodium has one electron in its outermost principal energy level, also known as the valence shell.
The principal quantum number for the outermost electrons in a Bromine atom in the ground state is 4. This is because the outermost electrons of an atom are located in the highest energy level, and for Bromine (with 35 electrons), the outermost electrons are in the 4th energy level.
A chloride ion has 8 electrons in its outermost energy level, since it has gained one electron from an atom of chlorine to achieve a stable electron configuration.
The principal quantum number for the outermost electrons in a bromine atom in the ground state is 4. This corresponds to the fourth energy level or shell in the atom, where the outermost electrons are located.
There are 3 electrons in the 3rd principal energy level of a phosphorus atom. This is because the atomic number of phosphorus is 15, indicating that it has 15 electrons distributed in different energy levels, with 5 of those electrons occupying the 3rd energy level.