Pisa radionetive isotope with a half life of 14.3 days. If you currently have 91.3 of p, how much was present 8.00 days ago

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

Which statement best describes what happens when molecular compounds melt