This is a chemical compound.
element
An element.
An element.
into smallest partical
element
Matter
That would be an Element.
An alloy.
Robert Boyle
A pure substance that cannot be chemically broken down into simpler substances.
A pure substance that cannot be broken down into simpler substances by physical or chemical means is an element. This is because Elements can't be broken down chemically into other substances because there is nothing to break them down into.
An element is a substance that cannot be broken down into simpler substances with all the characteristics of that element. Elements are composed of only one type of atom and they cannot be chemically decomposed into simpler substances.