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Unit 01 26-27

Atoms, Elements, & Compounds

TermDefinition
Atom The tiny building block of all matter. Everything around you is made of atoms.
Atomic Mass The average mass of an atom of an element. It is shown on the element square of the Periodic Table.
Atomic Number The number of protons in the nucleus of an atom. Every element has its own unique atomic number.
Chemical Formula A combination of chemical symbols and numbers that shows which elements are in a substance and how many atoms of each element are present.
Chemical Symbol A one- or two-letter abbreviation used to represent an element. The first letter is always capitalized.
Compound A pure substance made when two or more different elements are chemically combined in a fixed ratio.
Element A pure substance made of only one kind of atom.
Matter Anything that has mass and takes up space.
Particle Model A diagram that uses circles or spheres to show how particles are arranged and how they make up matter.
Periodic Table A chart that organizes all known elements and provides information about each one.
Property A characteristic of a substance that can be observed or measured, such as color, hardness, or melting point.
Subscript A small number written after a chemical symbol that tells how many atoms of that element are present in a chemical formula.
Molecule Two or more atoms that are chemically joined together. Molecules can be made of the same element (O₂) or different elements (H₂O).
Pure Substance Matter that is made of only one kind of particle. Elements and compounds are both pure substances.
Particle A very small piece of matter. Atoms and molecules are both examples of particles.
Formula A short way of writing a chemical formula using symbols and subscripts.
Created by: LMS 7 Sci
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