What is the mass number of an isotope of this atom that has 2 neutrons (shows 1 proton in picture

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

In a ball-and-stick molecular model, what do the sticks represent?

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.