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15 Cards in this Set

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A capital letter or a combination of a capital letter and small letter that is used to represent an element
Chemical Symbol
The horizontal row of elements
Period
An average of the masses of all the isotopes that occur in nature for an element
Average Atomic Masss
Vertical columns of elements
Groups
Elements in the middle of the periodic table, periods 4 through 7
Transition elements
The number of protons in an atom is
Atomic Number
Protons and neutrons can be subdivided into___by colliding them
Quarks
The center of an atom where protons and neutrons are located
Nucleus
A total count of the neutrons and protons in an atom
Mass Number
Atoms of the same element but with different numbers of neutrons
Isotopes
Elements that are found on the left side of the perodic table
Metals
Elements that have some properties of both metals and nonmetals
metalloids
The particles that move about the nucleus and have negative charge
electrons
The region around the nucleus occupied by electrons
Electron Cloud
A chart that shows the classification of elements
Periodic Table