If an unknown substance cannot be broken down into simpler substances it is made of one kind of atom and an element.
Elements cannot be changed into simpler substances by chemical means. To change them into simpler particles, you need nuclear means.
Not: atoms The answer is an element
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because a substance cannot be decomposed into simplier substances by chemical or physical means
These are the chemical elements.
Any substance that cannot be broken down into simpler substances is an?
An Element ... A substance that cannot be broken down into simpler substances by chemical means.
An element cannot be separated into simpler substances by chemical means.
element
Elements cannot be changed into simpler substances by chemical means. To change them into simpler particles, you need nuclear means.
Its Elements
element
Elements
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
Not: atoms The answer is an element
This change is possible.
cannot be broken down into simpler substances by chemical means