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JEE Advanced levelSingle correct optionDifficulty 3 of 3pt025

A not yet discovered element is given the temporary IUPAC systematic name unbinilium. Its atomic number and expected position are

  1. AZ = 120; valence configuration ; s-block, group 1, period 8
  2. BZ = 102; valence configuration ; f-block, period 7
  3. CZ = 120; valence configuration ; s-block, group 2, period 8
  4. DZ = 120; valence configuration ; g-block, period 8

Answer: C

The roots are un = 1, bi = 2, nil = 0, so Z = 120. Element 119 starts period 8 with one 8s electron, so element 120 completes the 8s subshell with two electrons: group 2, period 8, s-block.
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