Typing Out Nuclear/Symbol Equations Is there any way on typing out nuclear equations/symbol equations (With the two numbers at the top and bottom in front of the element)? 

One of my friends have used an app that does this for him automatically, but he refused to tell me the name of the app.

An example of the result would be:
There's an online LaTeX editor here: http://www.codecogs.com/latex/eqneditor.php

To express the example you gave, just enter this in the box:
_{6}^{14}\textrm{C}

The site will generate the image for you