Which of the following is a balanced chemical equation? a, h2o2 → h2o + o2 b, 2 mg + hc1 → mgcl2 + h2 c, so2 + o2 + 2 h2o → 4 h2so4 d , 2 fe2o3 + 3 c → 4 fe + 3 co2

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 is the most commonly accepted one