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.
Nausea is an uneasiness of the stomach that often comes before vomiting. Vomiting is the forcible voluntary or involuntary emptying (throwing up) of stomach contents through the mouth. What Causes Nausea or Vomiting? Nausea and vomiting are not diseases, but they are symptoms of many conditions such as: Motion sickness or seasickness Early stages of pregnancy (nausea occurs in approximately 50%-90% of all pregnancies; vomiting in 25%-55%)