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Question
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.
Solution
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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