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Which energy sublevel is being filled by the elements y to cd? 4d 5p 5s 5f 5d?
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Which energy sublevel is being filled by the elements y to cd? 4d 5p 5s 5f 5d?

User Csgroen
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Elements from Y to Cd are in the 5th period, and the are transitional metals,
so, sub-level should be d , and this d sub-level, is going to be on the level that is 1 less than number of the period (5-1=4).
Answer is 4d.
User Analydia
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