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[ Question Bank ] - 2022 — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10Science[ Question Bank ] - 20222 Marks
Question
Find the period in which these elements can be placed.
$_4Be,\ _{17}Cl,\ _2He,\ _{13}Al$
✓

Answer

  1. $_4Be-$ Electronic configuration is $(2, 2)$. It is placed in period $2.$
  2. $_{17}Cl-$ Electronic configuration is $(2, 8, 7)$. It is placed in period $3.$
  3. $_2He-$ Electronic configuration is $(2)$. It is placed in period $1.$
  4. $_{13}Al-$ Electronic configuration is $(2, 8, 3)$. It is placed in period $3.$

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