Explanation:
To write the electronic configuration of an atom, some principles must be followed.
Some these principles are:
- maximum number of electrons in the orbitals of sublevels are:
two electrons for s-sublevel
six electrons for p-sublevel
ten electrons for d-sublevel
fourteen electrons for f-sublevel
- Sublevels with lower energies are filled before those with higher energies according to Aufbau's principle
- No two electrons can have the same set of the four quantum numbers according to Pauli Exclusion principle.
- Hund's rule of maximum multiplicity states that electrons go into degenerate orbitals of sub-levels singly before pairing commences.
Based on this:
Phosphorus - 15 is 1s² 2s² 2p⁶ 3s² 3p³
Cobalt - 27 is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s²
Learn more:
Quantum theory brainly.com/question/9288609
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