Which quantity represents the number of protons in an atom?
(a) atomic number
(b) oxidation number
(c) number of neutrons
(d) number of valence electrons

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots