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For example, oxygen, nitrogen. How to type the "2" behind them?

Superscript and subscript are referred to as "superscript" and "subscript". Usually used in WORD.

There are two ways to enter superscript and subscript in Word.

1. Through the menu. Enter all the text, then select the part that needs to be changed to superscript or subscript, then click the "Format" menu, "Font", and check the box for superscript or subscript. For office 2007 and above, you can directly click the shortcut icon in the Start tab.

2. Through shortcut keys. Enter all the text, then select the part that needs to be changed to a superscript, and press the "Ctrl+=" shortcut key. Select the part that needs to be changed to a subscript, and then press the "Ctrl+Shift+=" shortcut key. None of the shortcut keys include double quotes.