![]() This is because the electron affinity is the energy required to remove an electron from an atom. The ionic radius of an atom also decreases as the electron affinity of the atom increases. This is because the electron-electron repulsion force increases as the number of electrons in the atom increases. The ionic radius of an atom also increases as the number of electrons in the atom increases. This is because the stronger nuclear force attracts the electrons to the nucleus. The ionic radius of an atom increases as the number of protons in the nucleus increases. The ionic radius of an atom is the distance from the nucleus to the outermost electron. The size of an atom is also affected by the number of protons in the nucleus, as protons have a positive charge that pulls the electron shells closer to the nucleus. The further away the electron shells are from the nucleus, the larger the atom will be. The size of an atom is determined by the distance between the nucleus and the electron shells. The more non-metallic an element is, the smaller the ionic radius. The more metallic an element is, the larger the ionic radius. The trend in ionic radius is also determined by the type of element. The more electrons in the electron cloud, the smaller the ionic radius. Examples of groups of elements that are nonmetals are the nonmetals (of course), the halogens, and the noble gases.The trend in ionic radius is also determined by the number of electrons in the electron cloud. Examples of groups of elements that are metals include alkali metals, alkaline earths, basic metals, and transition metals. These elements are called metalloids or semimetals. There are also elements with properties intermediate between metals and nonmetals. The two main types of elements are metals and nonmetals.The exception is the elements at the very end of the periodic table, which have placeholder names (until they are officially discovered and named) and three-letter symbols. The element symbol is a shorthand notation that is either one capital letter or a capital letter and a lowercase letter. The exact information given for the element varies, but there is always the atomic number, the symbol for the element, and the atomic weight. Each element has its tile or cell in the periodic table.The top row goes with period 6, while the bottom row goes with period 7. These rows of elements, the lanthanides and actinides, are special transition metals. They are placed there because there wasn't room to put them where they should go. There are two rows of elements found below the main body of the periodic table.For example, elements of the halogen group all have a valence of -1 and are highly reactive. Atoms of each element within a group have the same number of electrons in their outermost electron shell. Elements belonging to one of the 18 groups will share similar properties. Each vertical column on the periodic table is called a group.As you move from left to right across a period, elements transition from displaying metal characteristics toward nonmetallic properties. Elements in the same period all have the same electron ground state energy level. There are seven periods on the periodic table. Each horizontal row on the periodic table is called a period.The original table organized the elements by increasing atomic weight. This is the biggest difference between today's periodic table and Mendeleev's periodic table. Every atom of element 118 has 118 protons. Until a new element is discovered, the last element on the table is element number 118. So element number 1 (hydrogen) is the first element. The atomic number is the number of protons in an atom of that element. Elements are listed in numerical order by atomic number.
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