PHOSPHORUS (P):
Protons: 15
Electrons: 15
Neutrons: 16
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Phosphorus has 15 protons, 15 electrons, and typically has 16 neutrons in its most common isotope, phosphorus-31.
The atom with seven valence electrons and two more protons than phosphorus is chlorine (Cl). Chlorine has 17 protons and 7 valence electrons, while phosphorus has 15 protons and 5 valence electrons.
One phosphorus atom contains 15 protons and 15 electrons, giving it an atomic number of 15.
Phosphorus has 16 neutrons in its most common isotope, phosphorus-31.
All phosphorus atoms have 15 protons (hence their atomic number of fifteen). Assuming the atom is neutral, it will also have an equal amount of electrons.