Which of the atoms are neutrally charged? ( has more than one answer ) A: 5 electrons 5 protons and 5 neutrons

B: 10 electrons 7 protons 7 neutrons

C: 18 electrons 19 protons 20 neutrons

D: 28 electrons 30 protons 36 neutrons

E: 36 electrons 35 protons 46 neutrons

F: 5 electrons 5 protons 6 neutrons.

G: 9 electrons 9 protons 10 neutrons

It's potassium i believe

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.