15 terms

Atomic Structure Vocabulary

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Electron
negatively charged particles surrounding the center of an atom.
Period
horizontal row on the periodic table
Atom
the smallest piece of matter that still retains the property of the element.
Atomic Number
number of proton's in an atom's nucleus
Electron Dot Diagram
Uses the symbol for an element and dots representing the number of electrons in the element's outer energy level.
Group
vertical column in the periodic table.
Isotope
atoms of the same element that have different numbers of neutrons.
Mass Number
sum of the number of protons and neutrons in an atom's nucleus.
Neutron
neutral particle, composed of quarks, inside the nucleus of an atom.
Nucleus
positively charged center of an atoms that contains protons and neutrons and is surrounded by a cloud of electrons.
Periodic Table
organized list of all known elements that are arranges according to repeated changes in properties.
Proton
positively charged particle, composed of quarks, inside the nucleus of an atom.
Electron Cloud
area around the nucleus of an atom where the atom's electrons are most likely to be found.
Quark
particles of matter that make up protons and neutrons.
Average Atomic Mass
weighted average mass of the mixture of an element's isotopes.
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