Newton's second law of motion states that when a certain force is acted on an object then it is equal to the mass m of that object multiplied by the acceleration a of the object.
Mathematically, the relation is as follows.
F = m × a
Thus, we can conclude that when an object is acted on by an unbalanced force then the object will start to accelerate.
Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.