Problem: Which of these atoms has the largest number of neutrons in the nucleus?(a) 148Eu (b) 157Dy (c) 149Nd (d) 162Ho (e) 159Gd

FREE Expert Solution

We are asked which of these atoms has the largest number of neutrons in the nucleus?


Recall that the atomic mass is the sum of protons and neutrons. 


Atomic mass = # of protons + # of neutrons


Recall: Atomic # = # protons


(a) 148Eu 

  • Atomic number = 63
  • #neutrons = 148 -63 = 85


(b) 157Dy 

  • Atomic number =  66
  • #neutrons = 157 -66 = 91


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Problem Details

Which of these atoms has the largest number of neutrons in the nucleus?

(a) 148Eu 

(b) 157Dy 

(c) 149Nd 

(d) 162Ho 

(e) 159Gd

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