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The isotope 87Sr- strontium and also some other isotopes as:

55 32 Ge

54 33 As

53 34 Se

52 35 Br

51 36 Kr

50 37 Rb

48 39 Y

47 40 Zr

46 41 Nb

45 42 Mo

44 43 Tc

43 44 Ru

- where the first column is the number of neutrons, the second the number of protons.

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