Most atoms are stable with a configuration of eight valence electrons. This is known as the octet rule. How many valence electrons does each atom have

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

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter