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.
Posterior Cruciate Ligament Injury. The posterior cruciate ligament is important for stabilizing the knee and preventing it from bending back the wrong way. Symptoms. Symptoms of a PCL injury typically include pain at the time of injury which, over time, may also be felt in the calf region. There will be swelling, although this may be minimal. The athlete may complain of instability of the joint, perhaps associated with the feeling of the knee giving way.