How to Write "NH4" in MS Word

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"NH4" presents the chemical formula for a compound known as ammonium, which contains one nitrogen atom and four hydrogen atoms. Ammonium is formed when an ammonia molecule, represented by NH3, takes on one additional hydrogen ion. The ammonium formula is often written as NH4+ to indicate that the molecule is positive. To write this formula -- or any chemical formula -- in Microsoft Word, you need to use the subscript and superscript features.

  • Open the Word document in which you want to write "NH4" and click on the spot in the text where you want to write this formula.

  • Type a capital "N"; while holding down the "Shift" key on your keyboard, press the "N" key once.

  • Type a capital "H"; while holding down the "Shift" key on your keyboard, press the "H" key once.

  • Click on the "Home" tab on the Ribbon in Microsoft Word

  • Click the "Subscript" button on the Ribbon, in the Font group; the button shows the letter X and a subscript 2. Or, to activate the subscript feature using a keyboard shortcut, press "Ctrl" and "=" on your keyboard at the same time.

  • Type the numeral "4" on your keyboard.

  • Click the "Subscript" button again, or press the "Ctrl" and "=" keys again, to deactivate the subscript feature.

  • Click the "Superscript" button on the Ribbon; it shows the letter X and a superscript 2. Or, use the keyboard shortcut: Press "Ctrl," "Shift" and "=".

  • Type a plus sign: Hold down the "Shift" key and press the "=" key one time.

  • Turn off the superscript feature by pressing the "Superscript" button again or by pressing "Ctrl," "Shift" and "=" on your keyboard again.

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  • Photo Credit Jupiterimages/BananaStock/Getty Images
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