There are so many examples for that in different areas, like alkyl silane experiment carried out in our lab recently.
Here's one link: http://www.alfa-chemistry.com/products/alkyl-silane-29.htm
Answer:
Halife of C-14 is=14(RAM÷2)
You get=7 but further more let's say after 3 half life as your question stated it may result to decimal something which is impossible (as nucleons never be decimal)
Hence after 3half life it will continue to be 7
