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For the La and Ac and the Lu and Lr periodic tables, the following two tables (courtesy of Sandbh) compare the idealized numbers of f electrons for period 6 and 7 f-block elements with the actual numbers of f electrons in their solid states (rather than their gaseous states). There are 6½ irregularities in the first table compared to 21½ in ...
Like the other alkaline earth metals (group 2 of the periodic table) it occurs naturally only in combination with other elements and almost always has an oxidation state of +2. It reacts readily with air to form a thin passivation coating of magnesium oxide that inhibits further corrosion of the metal. The free metal burns with a brilliant ...
Black phosphorus or β-metallic phosphorus is the least reactive allotrope and the thermodynamically stable form below 550 °C (823 K). In appearance, properties, and structure, it resembles graphite , being black and flaky, a conductor of electricity, and having puckered sheets of linked atoms.