CBSE Class 11-science Answered
Properties |
Across the period (left to right) |
Down the group (top to bottom) |
Atomic size |
Decreases |
Increases |
No. of valence electrons |
Increases |
Remains same |
Metallic character |
Decreases |
Increases |
Non-metallic character |
Increases |
Decreases |
Electron affinity |
Increases |
Decreases |
Electronegativity |
Increases |
Decreases |
Ionisation energy |
Increases |
Decreases |
Basic nature of oxides |
Decreases |
Increases |
Melting point |
Increases from Group I to Group IV and then decreases |
Decreases in Groups I and II Decreases in Groups III and IV Increases in Groups V to VII |
Boiling point |
Increases from Group I to Group IV and then decreases |
Decreases in Groups I and II Decreases in Groups III and IV Increases in Groups V to VII |
Oxidising nature |
Increases |
Decreases |
Reducing nature |
Decreases |
Increases |