Atoms:
* The fundamental building blocks of matter. Atoms are incredibly tiny and consist of a dense central nucleus surrounded by a cloud of negatively charged electrons.
* The nucleus contains protons (positively charged) and neutrons (no charge). The number of protons determines the element the atom represents (e.g., one proton = hydrogen, six protons = carbon).
* Electrons are constantly moving around the nucleus in specific energy levels (shells). These shells determine how an atom interacts with other atoms.
Molecules:
* Formed when two or more atoms bond together. These bonds are formed by the sharing or transfer of electrons between atoms.
* Can be composed of the same element (like oxygen gas, O2) or different elements (like water, H2O).
* Molecules have properties that are different from the individual atoms they are made of. For example, water is a liquid at room temperature, while hydrogen and oxygen are gases.
Electrons:
* Subatomic particles with a negative charge. They orbit the nucleus of an atom.
* Responsible for chemical bonding. Electrons in the outermost shell (valence electrons) are involved in sharing or transferring electrons to create bonds.
* Carry energy. The movement of electrons within an atom is responsible for how atoms absorb and emit light.
In summary:
* Atoms are the basic units of matter.
* Molecules are formed from two or more atoms bonded together.
* Electrons are the subatomic particles that are responsible for chemical bonding and the properties of atoms and molecules.
Think of it like this:
* Atoms are like Lego bricks.
* Molecules are like structures built from those Lego bricks.
* Electrons are like the little connectors that hold the Lego bricks together.
