Question

an atom x has mass number 31 and electroni configuration 2,8,5 . how many protons and neutrons are present in the atom​

Answer 1

Answer:

i do not know this answer

Answer 2

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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