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प्रश्न
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
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उत्तर
Let us explain the properties by taking the example of sodium (Na) in group 1 and chlorine (Cl) in group 17:
| Properties | Group 1 | Group 17 |
| i) Atomic number | Na, atomic number is 11 | Cl, atomic number is 17 |
| ii) Size of the atom | Na has a smaller size than Cl | Cl has a larger atomic size comparatively |
| iii) Metallic character | Na is a metal, shows more metallic character | Cl is non-metallic |
| iv) Valence electron | Number of valence electrons is 1 for Na metal | Number of valence electrons is 7 for Cl |
| v)Electronegativity/ Electropositivity | Na is electropositive in nature | Cl is electronegative in nature |
| vi) Chemical reactivity | Na is basic in nature | Cl is acidic in nature |
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