Basic Chemistry Concepts

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Finite

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Having limits or bounds (ex. There are a finite number of elements on the periodic table - 118.)

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Compound

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A substance formed when two or more different elements are chemically bonded together.

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Hierarchical

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Arranged in order of rank.

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Atomic Number

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The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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Periodic Table

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A table of the chemical elements arranged in order of atomic number.

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Atomic Mass

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The mass of an atom, typically expressed in atomic mass units (amu); protons + neutrons

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Proton

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A subatomic particle found in the nucleus of every atom, carrying a positive charge. It also affects the mass.

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Neutron

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A subatomic particle found in the nucleus of atoms that is neutral, meaning it has no charge. It also affects the mass.

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Electron

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A subatomic particle with a negative charge, found in all atoms and acting as the primary carrier of electricity in solids. It affects the charge.

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Atomic Theory

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A scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms and that the atom is the basic unit of an element.