They are divisible into 100,000,000 parts. So you can pay for a $50 item with 0.05 BTC and still have 0.95 BTC in your wallet to spend.

Thank you, I did not know that.

So once split I guess the likely hood is that the coin will never be whole again.

If you get sent another 0.05 BTC to your wallet, you will have a 1 BTC balance again.

The single unit (1 Bitcoin) is just an arbitary measurement.