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Which of the following represents a pair of isotopes? Atomic Number Mass Number

ID: 863542 • Letter: W

Question

Which of the following represents a pair of isotopes?
Atomic Number     Mass Number

I    7           16
II    8      16

I     17         35
II      17         37

I      7         17
II       8         18

I     17         37
II      18         38

I     17         37
II      18         37

a.

I    7           16
II    8      16

b.

I     17         35
II      17         37

c.

I      7         17
II       8         18

d.

I     17         37
II      18         38

e.

I     17         37
II      18         37

Explanation / Answer

I     17         35
II      17         37

b.

I     17         35
II      17         37

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