Examlex
To see a rainbow,a person must face the falling rain with the Sun at their backs.
Element
Substance composed of atoms of only one kind.
Chemical Characteristics
Properties or behaviors of substances that describe their composition, reactivity, and the changes they undergo during chemical reactions.
Atom
The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, and electrons orbiting the nucleus.
Matter
Anything that occupies space and has mass, composed of atoms or molecules.
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