Metallic properties tend to increase across a period from "summary" of The Periodic Table: A Very Short Introduction by Eric R. Scerri
The trend of increasing metallic properties across a period on the periodic table is a fundamental principle of chemistry. As one moves from left to right across a period, the metallic properties of elements tend to increase. This trend can be explained by the atomic structure and electronic configuration of elements. Metals are characterized by their ability to conduct electricity and heat, as well as their luster and malleability. These properties arise from the presence of loosely held electrons in the outermost energy level of metal atoms. In general, metals tend to lose electrons easily, forming positively charged ions known as cations. Across a period, the number of electrons in the outermost energy level of elements increases, leading to a greater tendency to lose electrons and exhibit metallic behavior. This i...
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