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

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