Which one looks better? i am trying to find a promise ring for my bubba <3

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.

Which is an example of a highly unstable isotope that is often used in fission reactions?