What makes each type of atom different from one another

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

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