Element
Homogeneous matter
Atom
John Dalton provided the basic theory about the nature of matter.
All matter composed of certain basic substance called
The basic building block of all matter is the atom.
A substance that is composed of only one kind of matter is called an element. The smallest particle of an element is called an atom.
Atom
When a change in matter alters the basic nature of a substance, it is called a chemical change. In a chemical change, the substances involved react to form new substances with different properties than the original ones.
Atoms are the basic building blocks of matter.
A material made up of only one kind of matter is called a pure substance. It has a uniform composition and specific properties.
A change in some properties of matter without forming a different kind of matter is called a physical change. This can involve changes in state, shape, size, or appearance of the substance, but the chemical composition remains the same.
The basic unit of matter is called an atom. An atom consists of a cloud of negatively charged ions that surrounds a dense nucleus.