How many valence electrons does phosphorous have?

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Answer


Alexia

Concept:

 

The distribution of electrons in different orbitals is called electronic configuration. The electrons filled in the outermost shell or the electrons present in the highest principal energy level are called valence electrons.

 

The filling of electrons in different energy levels or orbitals is done in accordance to Aufbau principle. It states that electrons are filled in the orbitals in order of increasing energy of the orbitals. The increasing order of energy of the orbitals is as follows:

 

Solution:

 

The atomic number of phosphorous is 15. The number of electrons in phosphorous is 15. The electronic configuration of phosphorous is as follows:

 

 

The highest principal energy level is 3. The electrons present in 3s and 3p orbital are valence electrons. Distribution of electrons in different orbitals in the phosphorous atom is shown as:

 

 

Therefore, the number of valence electrons in an atom of phosphorous is 5.

 

 

 

Similar problems:

 

Question:

 

1. How many valence electrons does carbon have?

 

Solution:

 

The atomic number of carbon is 6. The number of electrons in carbon is 6. The electronic configuration of carbon is as follows:

 

 

The highest principal energy level is 2. The electrons present in  2s and 2p orbital are valence electrons. Distribution of electrons in different orbitals in carbon atom is shown as:

 

 

Therefore, the number of valence electrons in an atom of carbon is 4.

 

 

 

Question:

 

2. How many valence electrons does oxygen have?

 

Solution:

 

The atomic number of oxygen is 8. The number of electrons in oxygen is 8. The electronic configuration of oxygen is as follows:

 

 

The highest principal energy level is 2. The electrons present in 2s and 2p orbital are valence electrons. Distribution of electrons in different orbitals in oxygen atom is shown as:

 

 

Therefore, the number of valence electrons in an atom of oxygen is 6.

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