Oxygen is in which period in the periodic table?

Question:

Periodic Table:

Every known chemical element is described by some elemental symbol, such as "Na" for sodium. The elements are represented by their respective symbols in the periodic table. One important feature of this table is the numbering of the elements, which represents their atomic number, equal to the number of protons present in each of their atoms. The structure of the periodic table in terms of periods and groups carries important meaning regarding the chemical properties of the elements.

Answer and Explanation: 1