Back Elementos d'o periodo 5 AN आवर्त 5 तत्व ANP عناصر الدورة الخامسة Arabic Elementos del periodu 5 AST Dövri sistemin beşinci periodu Azerbaijani पीरियड 5 तत्व Bihari পঞ্চম পর্যায়ের মৌল Bengali/Bangla Elements del període 5 Catalan 5. perioda Czech Elfen cyfnod 5 Welsh
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A period 5 element is one of the chemical elements in the fifth 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 behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that elements with similar behaviour fall into the same vertical columns. The fifth period contains 18 elements, beginning with rubidium and ending with xenon. As a rule, period 5 elements fill their 5s shells first, then their 4d, and 5p shells, in that order; however, there are exceptions, such as rhodium.