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Question

What are nucleons? How many nucleons are present in phosphorus ? Draw its structure.

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Solution

Nucleons refer to the number of protons and neutrons present in an element.
The name " Nucleons" comes from the fact the species residing in the nucleus of the element.

Thus Nucleons = neutrons + protons,
Phosphorous has an atomic number 15.
The number of electrons = no.of protons = atomic number of the element
So the no.of protons in phosphorous =15
The mass number of Phosphorous = 31
So the no.of neutrons present in Phosphorous = 31-15 =16
Thus the no.of nucleons present in phosphorous = 15+16 =31

The atomic structure of phosphorous is at the top


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