Elements and Compounds
Matter is classified by composition; pure substances have fixed composition and are elements or compounds, unlike variable physical mixtures.
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Elements and Compounds: Matter and Pure Substances
Matter is classified by composition; pure substances have fixed composition and are elements or compounds, unlike variable physical mixtures.
Open article →Elements: Meaning and Main Classes
An element is matter in its simplest form; elementary properties group elements as metals, non-metals or metalloids.
Open article →Metals, Non-Metals and Metalloids
Metals generally conduct and can be shaped; non-metals usually conduct poorly; metalloids combine traits of both groups.
Open article →Compounds: Formation and Properties
A compound forms when different elements combine chemically in a fixed proportion and produces a substance with new properties.
Open article →Chemical Symbols and Formulas
Symbols identify elements, while formulas combine symbols and subscripts to state which atoms and how many occur in a molecule.
Open article →Atomicity and Formula Counts
Atomicity is the total number of atoms in one molecule and is found by reading and summing the counts represented in its formula.
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