Examples of groups of elements that are nonmetals are the nonmetals (of course), the halogens, and the noble gases.Atomic mass of all elements (along with the rounded off values) is mentioned in the chart below. 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.
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