Question
A unit cell of NaCl is made up of:
- 4Na+ ions and 4Cl– ions
- 4 Na+ ions and 8Cl– ions
- Na+ ions and Cl– ions
- Both A and C
Hint:
The number of ions is calculated by checking the crystalline structure.
The correct answer is: Both A and C
- A unit cell of NaCl is made up of sodium ions and chlorine ions where Na ions, as well as Cl ions, are 4 in number.
- Sodium chloride has a cubic central system and an fcc crystalline structure. It consists of 4 positive charges called cations and 4 negative charges called anions.
- As we can see, there are four ions present in each unit cell of a face-centered cubic structure, thus we can say that the number of NaCl units in a unit cell of NaCl is four.
The ionic structure is overall neutral if positive charge is equal to the negative charge.
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