pretty sure it's both are physical changes.
Answer:
A
Explanation:
Mass is a raw measurement, weight is effected by gravity
Sodium. It reacts with most of every other element.
Group 1 elements since they have one outermost electron which they can give to chlorine which has 7 outermost electrons in order to form a stable compound.
Example
Pottasium (K) + Chlorine (Cl) = Potassium Chloride (KCL)
