What does the diagram represent? a) a neutral oxygen atom b) an oxygen atom with 7 protons c) an oxygen ion with a +2 charge d) an oxygen ion with a -2 charge

Contained in chromosomes which are located in the nucleus of the cell.

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.

C) repel each other if im right : 3