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Chapter 4 Glossary

Atomic number number of protons in an atom
Atoms the particles that make up all materials; the smallest part of a element that can take part in a chemical reaction
Electron configuration arrangements of electrons in electron shells
Electron shells also known as energy levels, the regions surrounding the nucleus where electrons may be found
Element a substance composed of atoms with the same atomic number, 118 are known to exist
Energy levels also known as electron shells, the regions surrounding the nucleus where electrons may be found
Ground state the lowest energy arrangement of an atom's electrons in energy levels (shells)
Indirect evidence evidence that does not involve direct observation
Nucleus heavy core at the centre of the atom, made of protons and neutrons
Created by: theana