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17 Cards in this Set

  • Front
  • Back
Atom
Smallest particle of an element; building block of matter.
Atomic Number
Th number of protons in an atoms nucleus.
Bohr Diagram
small positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
chemical symbol
natural elements with symbols of one of two letters, first letter capital, second letter lowercase.
electron
a stable subatomic particle with a charge of negative electricity.
energy level
fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
family
a group that is related to one another.
isotope
each of two or more forms of the same element that contain equal number of protons but different numbers of neutrons in their nuclei.
mass number
the sum of the number of neutrons and protons in an atomic nucleus
metalloid
an element whose properties are intermediate between those of metals and solid nonmetals or semiconductors.
metal
a solid material that is typically hard, shiny, malleable,fusible, and ductile, with good electrical and thermal conductivity.
neutron
a subatomic particle of about the same mass as a proton but without an electrical charge.
non-metal
non-metals never exhibit metallic properties.
nucleus
The central and most important part of an object.
period
elements are arranged in a series of rows so that those with similar properties appear in vertical columns.
Periodic Table
arrangement of the chemical elements according to atomic number
proton
a stable particle with positive charge equal to the negative charge of an electron