According to scientific data on climate change, what levels have risen by 30% over the past 200 years?
a. ozone
b. argon
c. carbon dioxide
d. krypton

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

the ratio of the conjugate base to the acid required to attain the desired ph.