according to the graph, during which year did an event reduce the carrying capacity of the aria year 3 year 6 year 10 year 11

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

wher is the rest of the question

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.