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JEE Advanced levelSingle correct optionDifficulty 3 of 3pt033

The ground-state configuration of palladium is with no electron in 5s. Its group and period are

  1. Agroup 10, period 5
  2. Bgroup 12, period 5
  3. Cgroup 10, period 4
  4. Dgroup 8, period 5

Answer: A

For a d-block element the group number is the total of (n-1)d and ns electrons, here . Palladium is the 9th member of the 4d series (Y to Cd, period 5), so it lies in period 5 even though its 5s orbital is empty: group 10, period 5.
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