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- Multiple ChoicePlease save your changes before editing any questions.
Which element does not belong to Group I?
Sodium
Rubidium
Potassium
radium
- Multiple ChoicePlease save your changes before editing any questions.
Which element is the most reactivity?
Sodium
Potassium
Magnesium
Calcium
- Multiple ChoicePlease save your changes before editing any questions.
When you burn potassium in air, which colour flame will you obtain?
Lilac
Red
Blue
Yellow
- Multiple ChoicePlease save your changes before editing any questions.
Chlorine in potassium chloride would be replace by
Hydrogen
Iodine
Bromine
Fluorine
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