Answer :

6d has the higher energy level according to this sequence:

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p

6d according to the electron configuration table, the level of energy is higher when certain element ends in 6d.

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