Define d block elements

• Have valence electrons in their two outermost and shells. • D-block elements behave in a manner that is somewhere between that of highly reactive electropositive alkali metals and the covalent compound forming elements (which is why they are called "transition elements"). • Have high melting and boiling points. • Typically form colored salts. • Are generally good catalysts. Helmenstine, Anne Marie, Ph.D. "Identifying Element Blocks on the Periodic Table." ThoughtCo, Aug. 25, 2020, thoughtco.com/periodic-table-element-blocks-608788. Helmenstine, Anne Marie, Ph.D. (2020, August 25). Identifying Element Blocks on the Periodic Table. Retrieved from https://www.thoughtco.com/periodic-table-element-blocks-608788 Helmenstine, Anne Marie, Ph.D. "Identifying Element Blocks on the Periodic Table." ThoughtCo. https://www.thoughtco.com/periodic-table-element-blocks-608788 (accessed June 15, 2023).

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• Afrikaans • Anarâškielâ • العربية • Aragonés • Asturianu • Azərbaycanca • Basa Bali • বাংলা • Български • Bosanski • Brezhoneg • Català • Čeština • Dansk • Deutsch • Ελληνικά • Español • Esperanto • Euskara • فارسی • Français • Frysk • Galego • 한국어 • Հայերեն • हिन्दी • Hrvatski • Bahasa Indonesia • Interlingua • Íslenska • Italiano • Jawa • Latina • Lombard • Македонски • Bahasa Melayu • Nederlands • 日本語 • Norsk bokmål • Norsk nynorsk • Português • Română • Русский • සිංහල • Simple English • Slovenčina • Slovenščina • Српски / srpski • Srpskohrvatski / српскохрватски • Suomi • Svenska • தமிழ் • తెలుగు • ไทย • Türkçe • Українська • Tiếng Việt • West-Vlams • 粵語 • 中文 The division into blocks is justified by their distinctive nature: s is characterized, except in H and He, by highly electropositive metals; p by a range of very distinctive metals and non-metals, many of them essential to life; d by metals with multiple oxidation states; f by metals so similar that their separation is problematic. Useful statements about the elements can be made on the basis of the block they belong to and their position in it, for example highest oxidation state, density, melting point… Electronegativity is rather systematically distributed across and between blocks. PJ Stewart In Foundations of Chemistry, 2017 There is an approximate correspondence between this nomenclature of blocks, based on The Groups (columns) in the f-block (between groups 2 and 3) are not numbered. s-block [ ] …Na, K, ...