He leaped to the conclusion that there was a significant artificial element in its make-up.

As any artificial element, a standard atomic mass cannot be given.

Some of those artificial elements have half-lives of hours, even minutes.

He led the research that created nine artificial elements, all heavier than uranium.

I dislike it, feeling that it introduces an artificial element to the game.

At most two sections can be composed entirely of artificial elements.

There was thus an artificial element in his punctilio that at times might almost raise a smile.

Nobelium (No) is an artificial element, and thus a standard atomic mass cannot be given.

This fight for every trick introduces an artificial element to the game.

Like all artificial elements, it has no stable isotopes.