1-4 is a pair- 1 defines a molecule and 4 extends the description of the collection” mentioned in 1
3 follows by describing electron and 2 ends the sequence by mentioning the difference between these and the nucleus.
Hence 1,4,3,2 is the correct sequence and B is the correct answer.
A | B | C | D | Average |
---|---|---|---|---|
3 | 4 | 4 | ? | 4 |
3 | ? | 5 | ? | 4 |
? | 3 | 3 | ? | 4 |
? | ? | ? | ? | 4.25 |
4 | 4 | 4 | 4.25 |