7. indicate whether the following species have a stable noble gas configuration,
rb
ar
ca2
ci 1
0-2
c-4
s
fr+1

Where are chemicals found at work? a. only in cleaning products b. only in carpets and paint c. in every area of work d. only in food preparation submit

Which position represents spring in the southern hemisphere? a) b) c) d)

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer