NCERT Class XI Chemistry Classification of Elements and Periodicity in Properties Solutions
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Question : 26
Total: 40
What are the major differences between metals and non-metals?
Solution:
| Metals | Non-metals |
|---|---|
| 1. They are usually solids at room temperature. Mercury is an exception. | They may be solids or gases at room temperature. |
| 2. They have high melting and boilingpoints. | They have low melting and boiling points. |
| 3. They are good conductors of heat and electricity. | They are not good conductors of heat and electricity. |
| 4. They are malleable and ductile. | They are neither malleable nor ductile. |
| 5. They have 1 to 3 electrons in their valence shells. | They have 4 to 7 electrons in their valence shells. |
| 6. They have low ionisation energies. | They have high ionisation energies. |
| 7. They have low electron affinities. | They have high electron affinities. |
| 8. They are electropositive. | They are electronegative. |
| 9. They are brittle and non-lustrous. | They are hard and lustrous. |
| 10. They are sonorous. | They are non sonorous. |
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