Writing Chemical Formula

The chemical formula for the ammonium ion is NH₄⁺.
In order to write this formula correctly you MUST show:

• capital (or uppercase) N for the element nitrogen
• capital (or uppercase) H for the element hydrogen
• a subscript number 4 to indicate the presence of 4 hydrogen atoms in the molecule
• a superscript + sign to indicate that the molecule has a positive charge

When you answer a question at ausetute.com.au requiring a chemical formula, you will need to use the buttons on the textbox provided to make a subscript number and a superscript charge sign.

Here is a quick lesson in how to type your chemical formula into the textbox so that it displays the correct formula and not an incorrect formula (like NH4+)