Question

a sample element x is taken which is written as 16 8 x. find number of electrons and neutrons in it and find mass number of x

Answer 1

Hi friend
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Your answer
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Given element = X

Now,
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Atomic number given = 8

We know,
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Atomic number = Number of protons = Number of electrons

Number of electrons = 8

Again,
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Mass number = Number of protons + Number of neutrons

=> Number of neutrons = 16 - 8 = 8

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Answer 2

No of Electron = Atomic no.
Electron = 8
Neutron = Mass no. - Atomic no.
= 16-8
Neutron =8
Mass no. = 16

and name of element is oxygen