Common · Knowledge
Period 5 element
Fifth row of the periodic table
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.
From Wikipedia
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.
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Period 4 element
Fourth row in the periodic table of chemical elements
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Period 6 element
Row 6 of the periodic table
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Period 7 element
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Period 2 element
Any of the chemical elements in the second row of the periodic table
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Group 5 element
Group of chemical elements
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Extended periodic table
Refers to the extension on the periodic table beyond its current 7 periods including additional periods