An atom of argon has three electron shells, all of
which are full. its atomic mass is 40. how many
neutrons does it have?
a. 8
c. 20
e. 24
b. 16
d.22

answer; /// i believe the correct answer is (thrombocytopenia); (a)

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher