indestructible
unbreakable
element
An element cannot be broken down into a simpler substance by chemical means.
The word you're thinking of is likely "inseparable," which means unable to be divided or separated. This term is commonly used in various contexts to describe things that are tightly connected or cannot be broken apart.
The word you are looking for is "durable."
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
Yes spelt cannot But som lexicons do differentiate between "can not" and "cannot" "Cannot" is unequivocal: it means you do not have a choice; something you cannot do is not something you "can" or "can not" do. It means that you are not able to do that thing. You "can" or "can not" take the dog for a walk, depending on your mood. If you are confined to bed with a broken leg, however, you "cannot" take the dog for a walk, regardless of your mood.
an element is a substance that cannot be broken down into a simpler form by chemical means
The word mouth cannot be broken into syllables because it is a single syllable word.
The word 'kaput' is the german equivalent for the English word 'broken'.
cannot be broken down into simpler substances by chemical means
Ditch only has one syllable so it cannot be broken into syllables.