Chemistry Unit 2
Electron-confriguration
1s (2) 2s(2) 2p(4) is an ___ notation.
Primary
A principle quantum number of 7 would indicate that the __ energy level of an electron and the average distance from the nucleus were the highest.
Photon
A quantum of light is called a ___.
John Dalton
All matter is composed of extremely tiny particles called atoms that can combine in whole-number ratios with atoms of other elements to form compounds
Democritus
All matter is made up of tiny, indivisible, indestructible particles called atoms, which are infinite in number and always in motion
J. J. Thomson
An atom consists of a cloud of positively charged material in which negatively charged particles called corpuscles are embedded
Ernest Rutherford
An atom consists of a dense, positively charged nucleus surrounded by empty space in which negatively charged electrons orbit
Erwin Schodinger
An electron's properties within an orbital can only be described by a set of mathematical values called a quantum number; developed the wave-mechanical model of the atom
Sublevels
Each of the s,p,d,f __ can only contain a maximum number of electrons
Niels Bohr
Electrons can only travel in discrete orbits as specific distances from the nucleus and a specific amount of potential energy; they can only gain or lose energy by jumping to a higher or lower orbit
Max Planck
German physicist named __ proved that light emission and absorption can only be accomplished in discrete quantities of energy
emission spectrum
The _ is a pattern of bands of visible light produced by an excited atom when it returns to its ground state after being heated in a flame or charged with an electric arc
Heisenberg uncetainty
The _ principle states that is impossible to determine accurately both the position and the speed of an electron at the same time
Pauli exclusion
The _ principle states that no two electrons in the same atom can have the exact same set of quantum numbers
Aufbau
The _ principles states that the electron always occupies the orbital with the lower energy available
Principle
The _ quantum number (n) specifies the primary energy level of an electron an its average distance from the nucleus
Wave-particle duality
The _ theory states that light, as well as electrons have the properties of both waves and particles
Quatum
The minimum amount of energy that can be gained or lost by an atom is _.
Photoelectric effect
The phenomenon in which electrons are emitted from certain substances due to the absorption of light of specific frequencies is called the _.
Werner Heisenberg
The quantum matrix was developed by a German physicist named __.
Wolfgang Pauli
The scientist who discovered the principle that no two elections in the same atom can have the exact same set of quantum numbers is __.
Hund's
___ rule states that orbitals of equal energy are each occupied by a single electron before any orbital is occupied by a second electron