Answer: A neutral Phosphorus Atom has 5 valence electrons. This are contained in the third energy level the the atom.

You are watching: The valence electrons in an atom of phosphorus in the ground state are all found in

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The Phosphorus aspect as it would be stood for on a modern periodic table. Source
Phosphorus is an element which is component of group 15 (formally recognized as the Pnictogen group) and also is directly below the nitrogen atom. As was mentioned before, a neutral Phosphorus Atom has five valence electrons in the 3rd shell. You have the right to see a Bohr design of Phosphorus listed below this paragraph. It also supports the initial answer of five valence electrons.
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Bohr design of a Phosphorus Atom.

Due come the variety of valence electrons, Phosphorus is qualified of developing three bond with various other elements. Yet due to the fact that it has a third-energy level, that can form more than 3 bonds if that is favorable to execute so. Phosphorus has tendency to form an anion even though it has a short electronegativity. Due to its high reactivity, phosphorus is never uncovered a pure aspect on earth.

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Electron construction of Phosphorus through a Lewis diagram on the side together well.Source
The Valence electrons are discovered in different types of orbitals. Two are in the s-orbital (a circular orbital) when the other 3 space in p-orbitals (bell-shaped orbitals). There are a total of 4 orbitals in the valence shell to minimize electron-electron repulsion. Since their is less electron-electron repulsion, this formation is actually much more stable 보다 one through an extra electron. Because of this Phosphorus has a higher ionization 보다 its Group-16 (Chalcogen) neighbors Sulfur.
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Phosphorus as it move in a biochemical process.Source
Phosphorus is necessary for some functions in life and also is an essential component of productive soil. The moves together a compound (not as a pure element) with what is dubbed the Phosphorus cycle indigenous the floor to plants and then earlier into the air before returning to the soil. Phosphorus is additionally essential component of matches. It was found in 1669 by Hening Brand.Sources:http://thechemistryguru.com/phosphorus/