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Atomic Structure. — Science STD 8 — Question

Tamilnadu BoardEnglish MediumSTD 8ScienceAtomic Structure.4 Marks
Question
Write a note on valency with respect to –
  1. Chlorine
  2. Oxygen.
✓

Answer

1. Valency with respect to Chlorine:
- Since valency of chlorine is one, the number of chlorine atoms with which one atom of an element can combine is called valency.
- In sodium chloride ( NaCl ) molecule, one chlorine atom combines with one sodium atom. So, the valency of sodium is one.
- But, in magnesium chloride $\left( MgCl _2\right)$ valency of magnesium is two because it combines with two chlorine atoms.
2. Valency with respect to oxygen:
- Valency can be defined as double the number of oxygen atoms with which one atom of an element can combine because valency of oxygen is two.
- For example, in magnesium oxide $( MgO )$ valency of magnesium is two.

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