Group 1 Group 2a) One electron in the valence shellTwo electrons in the valence shell b) Larger atomic size compared to Group 2Smaller atomic size compared to Group 1c) More metallic in natureComparatively less metallic d) Highly electropositive, readily loses electronComparatively less electropositive e) Oxide formula: \\\\(X_2O\\\\)Oxide formula: \\\\(XO\\\\)f) Chloride formula: \\\\(XCl\\\\)Chloride formula: \\\\(XCl_2\\\\)