207 is the mass number. 82 would be the atomic number
Change in energy is E=hc/wavelength of emitted photon
I think it’s A sorry if i’m wrong
Answer:
There are three isotopes of silicons. They have masses numbers of 28, 29 and 30. The average amount of silicons is 28.086alum
Explanation:
I learned this in class three days ago so I hope this is helpful i'm in high school ask me for help when ever you want Iĺl help you