1(ii)
Which of the following element pairs will form an ionic bond?
| Pair | |
|---|---|
| P | Elements of Group 1 & Group 2 |
| Q | Elements of Group 14 & Group 16 |
| R | Elements of Group 2 & Group 17 |
| S | Elements of Group 15 & Group 18 |
- (a)P
- (b)Q
- (c)R
- (d)S
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R
Reason — An ionic bond is formed between a metal (low ionisation potential) and a non-metal (high electron affinity). Group 2 elements are metals which lose 2 electrons, while Group 17 elements are non-metals which gain 1 electron. Hence, the elements of Group 2 and Group 17 form ionic bond (e.g., MgCl2, CaCl2).
Pair P consists of two metals (no bond formation), Q consists of two non-metals (covalent bond), and S consists of a non-metal and a noble gas (no bond formed).