The structure of the atom. An atom is the smallest unit of matter that retains all of the chemical properties of an element. The first is the tiny atomic nucleus, which is in the center of the atom and contains positively charged particles called protons and neutral, uncharged, particles called neutrons.

atom

Solid. Something is usually described as a solid if it can hold its own shape and is hard to compress (squash). The particles in most solids are closely packed together. Even though the particles are locked into place and cannot move or slide past each other, they still vibrate a tiny bit.

A solid is a sample of matter that retains its shape and density when not confined. Examples of solids are common table salt, table sugar, water ice, frozen carbon dioxide (dry ice), glass, rock, most metals, and wood. When a solid is heated, the atoms or molecules gain kinetic energy .

-Solids have definite volumes and definite shapes. -Solids cannot flow. -Solids cannot easily be compressed. Solids : The particles in a solid are packed so closely together and therefore hold onto each other very tightly that they can barely move at all.

Liquids

• Oil in a puddle. Without a container, liquids form a pool or puddle. Oils are liquids that do not mix with water.
• Liquid metal. Mercury is a metal that is liquid at room temperature.
• Water in a glass. Liquids flow to fill the space around them.

Solids. Solids are objects that keep their own shape and do not flow in a given temperature. Ice is a solid but when it melts it becomes a liquid. Other examples of solids are cars, books and clothes. Solids can be different colors and textures, and they can be turned into different shapes, for example clay.

Matter changes state when energy is added or taken away. Most matter changes because of heat energy. Changes in pressure can change matter, too. The atoms and molecules that make up matter are always moving.

When a liquid changes into a solid, it is called solidification.

When a gas turns into a liquid, the process is called condensation.

Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water.

yes stone is an example of matter as matter is defined as anything g that has mass and occupies space.

In physics, usually the word “electricity” isn’t really used. “Electric current” is more common, and is defined as the flow of charges, where the charges are held by particles (electrons). Electrons have mass, so they are definitely matter.