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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
For an element, Z = 9. The valency of this element will be:
  1. 4
  2. 2
  3. 1
  4. 3
✓

Answer

  1. 1

Explanation:

Atomic number is 9, which means that number of electrons is also 9. Electronic configuration is 2 , 7. So, the atom will gain 1 electron to complete its octet. Therefore, the valency is 1.

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