2SO2 + O2 -> 2SO3 Use dimensional analysis to calculate how many moles of So3 will be produced if 11.2 grams of O2 are reacted.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.