These elements, unlike the transition elements, do not exhibit variable oxidation states, and their valence electrons are only present in their outer shell. All of these elements are solid, have a relatively high density, and are opaque. They have oxidation numbers of +3, Â±4, and -3. The Other Metals are: Aluminum Gallium Indium Tin Thallium Lead Bismuth This website is copyright Â© 1996-2012 Yinon Bentor. The 7 elements classified as other metals are located in groups 13, 14, and 15.
1 The embryo grows rapidly, and the baby's external features begin to form. 2  Your baby's brain, spinal cord, and heart begin to develop. 3  Baby's gastrointestinal tract starts to form.  It is during this time in the first trimester that the baby is most at risk for damage from things that may cause birth defects.
He and his colleagues determined that until the third trimester, the wiring at the point where you feel pain, such as the skin, doesn't reach the emotional part where you feel pain, in the brain. Although fetuses start forming pain receptors eight weeks into development, the thalamus, the part of the brain that routes information to other areas, doesn't form for 20 more weeks. Without the thalamus, Rosen says, no information can reach the cortex for processing.