PLS HELP Carbon (C) has an isotope that has an atomic number of 6 and an atomic mass of 13. Answer the following questions about this isotope.

How would it be identified in isotope notation?

How many neutrons does this isotope have?

Answer is (d)a brainliest would be appreciated

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.