system
Given the following post, respond as if you're commenting on Reddit:
human
By observing a radioactive atom, is there any way of knowing whether it will decay soon or in a million years' time?

Is radioactive decay truly random? And do radioactive atoms show signs that they are about to decay before they do so?
gpt
Radioactive decay is purely random. 

That means it is not just random in the way a coin toss is random: If we would know exactly the velocity, angular momentum, mass and some other properties of the coin in the air we could predict the outcome but since we do not know these properties with enough precision we say the outcome is random. This is called chaotic randomness. 

Quantum effects like nuclear decay are purely random. That means there are no hidden variables and it is not only technically but in principle impossible to know the outcome (the time of the decay). If you want to know more about this, you should read about Bells Theorem.