1) What is the lightest element in the universe? a) Uranium b) Hydrogen c) Carbon d) Lithium 2) Which element is needed for combustion? a) Oxygen b) Arsenic c) Sodium d) Argon 3) Which element has the symbol Al? a) Arsenic b) Aluminium c) Argon d) Adenoids 4) Which of these elements is a metal? a) Argon b) Chlorine c) Oxygen d) Magnesium 5) Which of these elements reacts violently with water? a) Selenium b) Bromine c) Potassium d) Iron

bởi Ẩn danh

Bảng xếp hạng

Phong cách trực quan

Tùy chọn

Chuyển đổi mẫu

Bạn có muốn khôi phục tự động lưu: không?