What makes some elements more reactive than others? compare and contrast group 1 and group 8?

In group 1 
There is more electrons that are free on the outer most shell This means it can attach to another .. whereas the electrons on the atomic structure of group 8 elements they have a full outer most shell meaning there are no free electrons roaming away  

The group 1 is called the alkali metal and they are highly reactive because they only have one electron in the outer shell and they want to attach to another element and they explode and compared to group 8 which only have 8 electrons in the outer shell they are not very reactive so they don't react as much as group one because they don't want to give away their electrons to another element

Answerit curves up and levels out.explanationwe assume that the container contains absolutely no ammonia to begin with as it states that "nitrogen gas and hydrogen gas" react to "produce ammonia."at dynamic equilibrium, the product and reactant concentrations are equal.this means that, starting from a concentration of zero, [nh₃] must curve "up" from zero and then level out to a constant concentration.