Atoms And Atomic Theory Vocab Flashcards
Atom
The smallest particle in which an element can be divided and still be the same substance
John Dalton
British chemist who developed his atomic theory gathered from observations gathered during his experiments
Electron
The negatively charged particles in an atom that are involved in the formation of chemical bonds
Particle
A tiny piece or part
Nucleus
The tiny extremely dense positively charged region in the center of an atom, made of protons and neutrons
Bohr model
The model of the atom that states that electrons move around the center of an atom’s nucleus and fixed orbit; also called the planetary model
Proton
The positively charged particles in the nucleus
Ernest Rutherford
Scientist who stated that the atom was most empty space and at the center was a small dense positively charged nucleus
Atom Model
A representation of an atom ( a picture of what the atomic theories explain )
Neils Bohr
Danish scientist who suggested that electrons travel around the nucleus in fixed paths
Fixed orbit
To revolve around an object in a fixed path
Neutron
The particles of the nucleus that have no charge
Quarks
The subatomic particles that make up protons,electrons, and neutrons
Subatomic particles
Any particles that are smaller than an atom
Electron cloud
The regions inside an atom where electrons are likely to be found
Mass number
The sum of protons and neutrons in an atom
John Thomson
British chemist who’s experiments with the cathode ray tube led to the discovery of the electrons. His model is known as the plum pudding model
Atomic mass unit
The SI unit used to express the masses of particles in an atom
Atomic number
The number of protons in the nucleus of an atom
Atomic mass
The weighted average masses of all the naturally occurring isotopes of an element
Chemical symbol
A shorthand way to write the name of an element
Isotope
atoms with the same number of protons but have different numbers of neutrons
Periodic table
A table of elements in order by increasing atomic mass
Energy level
A region of an atom in which electrons of the same energy are likely to be found
