To define: The terms orbital and electron shell.
Concept introduction: The basic unit of matter that has the properties of a chemical element is called atom. Atom is made up of subatomic particles (neutrons, protons, and electrons). The substance that is made from one type of atom is known as an element. Every element has a unique chemical symbol, atomic number, and atomic mass.
To relate: The electron shell to the principal energy levels.
Concept introduction: The basic unit of matter that has the properties of a chemical element is called atom. Atom is made up of subatomic particles (neutrons, protons, and electrons). The substance that is made from one type of atom is known as an element. Every element has a unique chemical symbol, atomic number, and atomic mass.
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