When we get to period 4-7 on the periodic table, we will require the use of thedandforbitals for transition metals and inner transition metals. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. Chlorine is a yellow-green gas at room temperature. Thechemical symbolfor Iodine isI. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Let's consider a few examples. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. The electron configuration and the orbital diagram are: Following hydrogen is the noble gas helium, which has an atomic number of 2. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Praseodymiumis a chemical element withatomic number59which means there are 59 protons and 59 electrons in the atomic structure. Now you are going to add the next electron to make Sc 2+. Electron Configuration for Cr, Cr2+, and Cr3+ (Exception to Rules) The helium atom contains two protons and two electrons. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. written as 1s2, where the superscript 2 implies the pairing of spins. Accessibility StatementFor more information contact us atinfo@libretexts.org. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Thechemical symbolfor Tin isSn. Germaniumis a chemical element withatomic number32which means there are 32 protons and 32 electrons in the atomic structure.
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