Assertion (S): The total angular momentum for light atoms (low atomic number) is obtained by Russell-Saunders coupling, whereas j-j coupling is used for heavy atoms (high atomic number). Reasoning (R): The spin-orbit interactions are weak in light atoms (low atomic number) and strong in heavy atoms (high atomic number). Select the correct option:

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Chemistry · Atomic Spectroscopy

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S and R are true; and R is the correct reason for S

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S and R are true; and R is the correct reason for S

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S and R are true; but R is NOT the correct reason for S

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