Answer: A neutral Phosphorus Atom has five valence electrons. These are had in the 3rd energy level of the atom.

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The Phosphorus facet as it would certainly be represented on a modern periodic table. Source
Phosphorus is an element which is component of group 15 (formally well-known as the Pnictogen group) and is directly listed below the nitrogen atom. Together was pointed out before, a neutral Phosphorus Atom includes five valence electrons in the third shell. You can see a Bohr model of Phosphorus below this paragraph. It likewise supports the original answer of 5 valence electrons.
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Bohr model of a Phosphorus Atom.

Due to the number of valence electrons, Phosphorus is capable of developing three bond with various other elements. Yet because it has a third-energy level, the can type more than three bonds if it is favorable to do so. Phosphorus tends to form an anion also though it has a short electronegativity. As result of its high reactivity, phosphorus is never found a pure facet on earth.

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Electron configuration of Phosphorus v a Lewis chart on the side together well.Source
The Valence electrons are discovered in different varieties of orbitals. Two room in the s-orbital (a one orbital) if the other 3 are in p-orbitals (bell-shaped orbitals). There space a full of 4 orbitals in the valence shell to minimize electron-electron repulsion. Since their is less electron-electron repulsion, this formation is actually more stable than one v an extra electron. Because of this Phosphorus has actually a greater ionization 보다 its Group-16 (Chalcogen) next-door neighbors Sulfur.
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Phosphorus together it moves in a biochemical process.Source
Phosphorus is vital for some features in life and is an essential component of fertile soil. The moves as a compound (not together a pure element) with what is called the Phosphorus cycle native the floor to plants and also then ago into the air before returning come the soil. Phosphorus is also essential component of matches. That was uncovered in 1669 by Hening Brand.Sources:http://thechemistryguru.com/phosphorus/