Question

on the basis of electronic configuration identify an element of oxygen group and a noble gas element

Answer 1

Oxygen has atomic number 8 in the periodic table and is located in period 2 and group 17 of the periodic table of elements. In order to write the electron configuration of this element, we use the noble gas preceding the period. In the case of Oxygen, the noble gas we use is Helium (He). We begin the configuration with the noble gas in brackets: [He]. We then continue writing the electron configuration from the noble gas (He) to the element oxygen as we normally would. Oxygen then becomes [He]2s22p4.When writing the configuration for elements farther down the periodic table, such as barium or iodine, this notation is especially helpful.

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