Pisa radionetive isotope with a half life of 14.3 days. If you currently have 91.3 of p, how much was present 8.00 days ago

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

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

b) nuclear ive learned that in a pedtrodic table