Which of the following is not a component of plasma?
a. carbon monoxide
b. blood
c. water
d. oxygen

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.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

you didnt put any of the following

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock