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A n element has mass no 40 and contains 21 electrons in its atom. In which group of periodic table does it belong?
 
Asked by ESHITA MUKHERJEE | 03 Feb, 2016, 07:10: PM
answered-by-expert Expert Answer
  • The given element has 21 electrons.
  • Outer electronic configuration of this element would be [Ar]3d14s2
  • After filling up of 4s orbital, the last electron enters in the 3d orbital.
  • So this element belongs to the group just next to the s block elements, that means first group of d-block elements.
  • This group is IIIB group of the periodic table.
Answered by Prachi Sawant | 04 Feb, 2016, 05:31: PM

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