Back Elementos d'o periodo 7 AN आवर्त 7 तत्व ANP عناصر الدورة السابعة Arabic Elementos del periodu 7 AST Dövri sistemin yeddinci periodu Azerbaijani पीरियड 7 तत्व Bihari সপ্তম পর্যায়ের মৌল Bengali/Bangla Elements del període 7 Catalan 7. perioda Czech Elfen cyfnod 7 Welsh
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A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases: a new row is begun when chemical behavior begins to repeat, meaning that elements with similar behavior fall into the same vertical columns. The seventh period contains 32 elements, tied for the most with period 6, beginning with francium and ending with oganesson, the heaviest element currently discovered. As a rule, period 7 elements fill their 7s shells first, then their 5f, 6d, and 7p shells in that order, but there are exceptions, such as uranium.