Examlex
Evaluate the expression for the given value of the variable or variables.
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Nucleus
The central and most important part of an atom, containing protons and neutrons and almost all of its mass.
Matter
Anything that occupies space and has mass, composed of atoms or molecules and is the substance that makes up the physical universe.
States
Different forms in which matter can exist, typically observed as solid, liquid, gas, and plasma.
Solid
A state of matter characterized by particles that are closely packed together, resulting in a fixed volume and shape.
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