Suppose you discovered protons shortly after thomas discovered electrons how would you revise the plum pudding model to include protons ?

i'm assuming that the correct answer is indeed the first one/ "a"..

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

i don't know people like to fight everywhere rip.