What is a characteristic of the polar water molecule?

It is attracted to other polar molecules due to the slight negativity and positivity. Because of this, the adhesion and cohesion also comes in play and allows the water to stay in position by binding to each other and to other molecules.

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.