Unit 3- Atomic Structure Flashcards
Ernest Rutherford
Nuclear Model
Niels Bohr
Electrons travel in fixed orbits around the nucleus of the atom
Democritus
Named the atom based on the Greek word meaning indivisible
Dmitri Mendeleev
Arranged the elements on the periodic table based on atomic mass
Dalton
Solid Sphere Model
Schrodinger and Heisenberg
Electron Cloud Model
Henry Moseley
Arranged the elements on the periodic table based on atomic number
JJ Thomson
Plum Pudding Model
Proton
A subatomic particle with a positive charge
Neutron
The subatomic particle with no charge (therefore electrically neutral)
Electron
A subatomic particle with a negative charge
Quarks
The smallest known particles that make up protons neutrons
Nucleus
The positively charged center of that atom where most of the mass of the atom is located
Electron cloud
The negatively charged area around the nucleus where the volume of the atom is located
Valence Electron
An electron with the most energy located in the electron cloud
Isotopes have different
number of neutrons
Isotopes have the same
atomic number
The farther an electron is from the nucleus the more what it has?
energy
The total number of electrons in the outer shell of a sodium is
1
The total number of neutrons in the nucleus of any atom is equal to the
mass number minus the atomic number
Two different isotopes of an element have different
number of neutrons
Two different isotopes of an element have the same
number of protons
An atom is neutral because
the number of protons and electrons are equal
What is the correct symbol for an isotope of carbon with 6 protons and 6 neutrons?
12C
