I believe it is an element.
Substance
A chemical change involve a change of composition.
Anything that has mass is matter.
mixture
Several chemical properties can be estimated knowing the chemical composition.
Matter with a definite composition is a pure substance, such as an element, molecule, molecular compound, or ionic compound.
pure substance
Matter with a definite composition is a pure substance, such as an element, molecule, molecular compound, or ionic compound.
Mass and chemical composition
Matter can be classified into 3 categories: 1.Solid 2.Liquid 3.Gas
Matter is classified as "mixtures" and "pure substances".
yes everything is classified as matter
Matter can be classified as elements, compounds, or mixtures.
chemical change = chemical reaction. ( the composition of matter always changes). In a chemical change the matter in one thing changes, for example you will know a chemical change has occurred when the color or odor has changes or when a new gas is given off.
An element, as opposed to a compound or mixture.
A chemical change involve a change of composition.