Plz help asap Choose all the answers that apply.

The elements in group 18 .

are highly reactive
are gases at room temperature
usually do not react with other elements
are in a group called the noble gases
are nonmetals

air quality

poor drinking water

and heavy polution

can lead to poor health

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.