element builder Flashcards
Atom
the basic unit of matter
Atomic number
the number of protons in the nucleus of an atom
Electron
a negatively charged particle that moves around the nucleus
Electron dot diagram
a diagram that shows the element symbol surrounded by dots representing valence electrons
Element
a pure substance that cannot be broken down into simpler substances by ordinary chemical means
Energy level
a particular region where electrons can orbit a nucleus
Ion
an atom or molecule that has an electrical charge because it has gained or lost electrons
Isotope
one of several forms of the same element
Mass number
the number of protons plus neutrons in the nucleus of an atom
Neutron
a particle with no charge located in the nucleus of an atom
Nucleus
the positively charged, dense center of an atom
Periodic table
a chart that organizes the chemical elements based on their properties
Proton
a positively charged particle located in the nucleus of an atom
Radioactive
capable of releasing radiation
Valence electrons
electrons found in the outermost energy level of an atom
