(03.02 LC)
Which of the following is a correct formula unit of an ionic compound?
AL2F3
Ca2O
Ca(OH)2
KCI2

1= c 2= a or d3 = idk sorry 4= c5= c

Sorry i dont understand the question can you rephase it?

Green is technically every other color but green but the other wavelengths of the other colors get absorbed by the object and the wavelength of the color green gets reflected

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.