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An elements with mass number 81 cont...

An elements with mass number 81 contains 31.7% more neutronsis compared to protons Assign the atomic symbol .

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Mass number (A ) = 56
Suppose atomic number = symbol of proton =Z three unit positive charge = number of electron
`= (z - 3) `
No of neutron = (No of electron ) + ( 30.4% of No of electron )
mass number (A ) = o of proton (Z ) = No. of neutron (n )
56 =z (1.304 Z =- 3.912 ) ... ( value of n from (iii) )
Z= 26.000 =26 atomic number Z=36
elements fe which charge + 3 ,z =26 and mass number =56
So symbol `.56, 26 Fe^(3+)`
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