![]() Since titanium is out there with four extra electrons, it is quite flexible and forms many compounds. It makes many natural compounds with halogens and oxygen. With a configuration of 2-8-10-2, titanium is out in the world and ready to bond with other elements. It adds its next electron to the third shell, not the outermost fourth shell. ![]() Being a transition metal, it has a special electron configuration. It's not just any metal, it's a transition metal. ![]() The fourth row of the periodic table has transition metals ranging from scandium (21) to zinc (30). Remember that the first eight were placed during our trip through the third period/row. Selenium is found in the fourth column of the p block and the fourth row of Figure 8.21. For the fourth period/row, all of these electrons build the third shell to a maximum of 18 electrons. Indeed, the electron configuration of Se is Ar4s23d104p4, as expected. This element is one of the transition elements that doesn't place the additional electrons in the outer shell, but in the one underneath. So remember when you look at our breakdown that the electrons aren't always in a nice neat order as shown here. They are found in clouds that can have different shapes that include spheres and dumbbell-like shapes. As you learn more about atomic structure, you will learn that the electrons don't stay in defined areas around the nucleus. The electrons like to be in separate shells/orbitals. In an atom, the electrons spin around the center, also called the nucleus. Each of those colored balls is an electron. The element is titanium, which has 22 electrons but hence it has formed an ion of 2 (it loses 2 electron to form an ion). If you think this is a little over your head, go back and look at the elements 1-18 that have organizations that are a little more simple. Let's take a look at the arrangements of electrons in the basic elements (left and right sides of the table) of period four and the more complex arrangements of the transition elements (in the middle of the row). 3Li, 14Si, 2He, 11Na, 15P Which of these elements belong to. You may have an easy way to know the number of electrons in a neutral atom, but the placement of those electrons gets a little more complex. Write down the electronic configuration of the following elements from the given atomic numbers. ![]() Now we're working with the fourth period/row in the table of elements. It tells you the mass of one atom, how many pieces are inside, and where it should be placed on the periodic table. That box on the left has all of the information you need to know about one element. ![]()
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