4. Plan an Investigation Using pennies and eyedroppers, develop a procedure to
compare the surface tensions of two liquids.

D. is the answer hope that you

B.1 - hydrogren-1 can only mean there is 1 neutron. it's obvious there is 1 proton or else it wouldn't be hydrogen, so they wouldn't put a number after it unless they were indicating the number of neutrons

Tell me the answer choices and i would be able to answer. : )

The name for subatomic particles in an atom is called a proton