an atom x has mass number 31 and electroni configuration 2,8,5 . how many protons and neutrons are present in the atom
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an atom x has mass number 31 and electroni configuration 2,8,5 . how many protons and neutrons are present in the atom
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Answer:
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Answer:
We know that ,
the no. of electrons = the no. of protons.
As the electronic configuration is 2,8,5.
So, the no. of electrons = the no. of protons =(2+8+5)=15.
We also know that,
Mass number
=no. of protons + no. of nutrons
Therefore,
No. of neutrons
=Mass number – No. of protons
=31–15=16.
Then, the element is phosphorus.
Step-by-step explanation:
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