period 2
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Period 2 refers to the six chemical elements that make up the second row of the periodic table, including familiar substances like carbon, oxygen, and nitrogen. These elements are important because they're among the most abundant in nature and form the basis of all known life on Earth.
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Period 2 in the periodic table
A period 2 element is one of the chemical elements in the second 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 started when chemical behavior begins to repeat, creating columns of elements with similar properties.