Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa

Na and Mg crystallize in bcc and fcc type crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is

  • Option 1)

    4 and 2

  • Option 2)

    9 and 14

  • Option 3)

    14 and 9

  • Option 4)

    2 and 4.

 

Answers (2)

best_answer

As we learnt in

z for body centered unit cell -

Lattice points: at corners and body center of unit cell.

For body centered cubic (BCC), z=2

- wherein

 

 

No. of atoms(z) for face centered unit cell -

Lattice points: at corners and face centers of unit cell.

For face centered cubic (FCC), z=4.

- wherein

 

 

 

bcc - Points are at corners and one in the centre of the unit cell.

Number of atoms per unit cell = 8\times \frac{1}{8}+1= 2

fcc - Points are at the corners and also centre of the six faces of each cell.

Number of atoms per unit cell = 8\times \frac{1}{8}+6\times \frac{1}{2}= 4

Correct option is 4.


Option 1)

4 and 2

This is an incorrect option.

Option 2)

9 and 14

This is an incorrect option.

Option 3)

14 and 9

This is an incorrect option.

Option 4)

2 and 4.

This is the correct option.

Posted by

Plabita

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main Maths 2025: Five tips to score high marks in ‘toughest’ subject; most important chapters
anam-khan

JEE Main 2025 exam city intimation slip for session 1 soon at jeemain.nta.nic.in
anam-khan

Focus on modern physics, formulas to solve tricky problems; 5 tips to tackle JEE Main physics 2025

Latest Question