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.
1 Torn ACLs are a common knee injury. 2  An ACL tear or sprain occurs when a sudden change in direction or pivot occurs on a locked knee. 3  A pop, followed by pain and swelling of the knee are the most common symptoms of an ACL tear. 4  Women are more likely to tear their ACL because of differences in anatomy and muscle function.