Bài tập 1: Sắp xếp lại các nguyên tố theo thứ tự a, Tính kim loại giảm dần: Si, Mg, Al, Na b, Tính PK giảm dần: C, O, N, F Bài tập 2: Sắp xếp lại các nguyên tố theo thứ tự a, Tính kim loại giảm dần: K, Mg, Na, Al b, Tính PK giảm dần: S, Cl, F, P Bài TẬP 3 :Nguyên tố A có số hiệu nguyên tử là 11,chu kỳ 3,nhóm I trong bảng tuần hoàn các nguyên tố hoá học Hãy cho biết: -Cấu tạo nguyên tử của A -Tính chất hoá học đặc trưng của A -So sánh tính chất hoá học của A với các nguyên tố lân cận

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