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