How do you calculate and determine atomic number, mass number, and net charge? Atomic number is the number of protons in an atom. Mass number is the number of neutrons in an atom, and net charge describes how the protons and electrons balance out. Tip: This isn't the place to ask a question because the teacher can't reply.
PCL Tear Symptoms & Diagnosis. 1  Pain. Mild to moderate pain in the knee can cause a limp, knee âgiving outâ, or difficulty walking. 2  Swelling. Within hours of the injury, knee will swell rapidly. 3  Instability. Feeling of a loose knee and not stable when standing or walking.
A PCL injury is a sprain â a stretch or tear of the ligament. PCL sprains are classified as follows. 1  Grade I: a mild injury that causes only microscopic tears in the ligament.  Grade II (moderate): The PCL is partially torn, and the knee periodically gives out when you stand or walk.