Question

Which of the following pair of atoms have fractional atomic weights? *
Sodium and chlorine
Chlorine and copper
Iron and sulphur
Copper and gold
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Answer 1

Chlorine and copper have fractional atomic weight from the following

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Answer 2

Answer:

Sodium and Chlorine - 35.5.

Chlorine and Copper - 134.45.

Iron and Sulphur - 119.975.

Copper and Gold - 196.966.

Sodium and Chlorine are the following pair of atoms have fractional atomic weights.