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.
All rights reserved. A computerâs intricate electrical network does not begin to compare with the network of over 100 billion neurons in your brain. During the last 11 weeks of pregnancy, the fetus typically doubles in overall weight, while brain weight doubles in the last 9 weeks of pregnancy.Much of the brainâs weight gain is due to the thickening of the myelin sheath around the nerves.By the end of pregnancy, the fetal brain is about a quarter of its eventual size and contains nearly all the neurons it will ever have: perhaps 100 billion (10 11).uch of the brainâs weight gain is due to the thickening of the myelin sheath around the nerves. By the end of pregnancy, the fetal brain is about a quarter of its eventual size and contains nearly all the neurons it will ever have: perhaps 100 billion (10 11).