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Molecule: A group of atoms bonded together. It's the smallest fundamental unit of a chemical compound.
Compound: Any substance composed of identical molecules consisting atoms of 2 or more chemical components. They are also held together by chemical bonds.
Element: An element is a pure substance consisting atoms that all have the same numbers of protons in their atomic nuclei. Chemical compounds can't be broken down into simpler substances by chemicals.
Mixture: A mixture has 2 more substances that are not chemically combined. Both substances retain their identities.
Heterogeneous: Heterogeneous mixtures are typically consisting of different distinguishable parts or elements. It contains two or more phases.
Homogeneous: It's a pure substance that consists of a single phase. The composition is uniform throughout the whole mixture.
Atom: It's the basic unit of a chemical element. Atoms are the smallest unit of ordinary matter that can form a chemical element.
Valence electrons: A valence electron is a negatively charged particle which is located in the outermost shell of an atom. They can participate in the formation of a chemical bond if the outer shell is not closed.
Covalent electrons: They're involved in covalent bonds which is a chemical bond that involves the sharing of electron pairs between atoms. The electron pairs are known as shared pairs or bonding pairs.
Ionic atoms: Atoms that participate in a type of chemical bonding called ionic bonding where the outermost electrons of one atom are transferred permanently to another atom. This happens because of the charge in atoms.
