Suppose an electron transitions to the second energy level by emitting a photos with a wavelength of 4.35 X 10-7m. On what energy level did the
electron originate Justify your answer

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

you gotta add the following molecules so we can give u an answer

explanation:

more infor would

a lot