Calcium belongs to group 2 of the periodic table, therefore the most likely when linked is that:
a) gain 2 electrons
2) share 2 electrons
3) lose 2 electrons
4) gain 6 electrons

Sorry i dont understand the question can you rephase it?

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.