What factor impacts the possible number of ways in which different atoms can be put together

How have the greenhouse gasses increased from the year 2000 to 2018

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg