When metals are next to each other, the valence electrons don't just stay on their own atom; they roam around the whole metal complex. They float free as though floating through a sea of electrons, much like an individual water molecule floats free in the sea. This is why it is called the electron sea model. Each metal atom allows its electrons to roam freely, so these atoms become positively charged cations. These cations are kind of like a positively charged island and are surrounded by a sea of negatively charged electrons. It looks a bit like this:
Nausea and vomiting are NOT diseases in and of themselves. They are symptoms of other conditions. For example, they can be a symptom of stomach flu, food poisoning, motion sickness, overeating, blocked intestine, illness, concussion or brain injury, appendicitis, inner ear conditions, and migraines.
Vomiting: A Few Common Causes. There are dozens of conditions that can lead to vomiting or nausea, but there are a few more common causes. Gastroenteritis: This is what most of us call the stomach flu (though itâs not related to influenza). Gastroenteritis can be caused by bacteria, viruses, and parasites â and often leads to diarrhea and vomiting in adults and kids.