Atomic Structure

Dalton

The theory was that all matter is made up of atoms. His model was of tiny, indestructible spheres that had little structure. (1803)

Thomson

His model had electrons after his discovery in 1897. They were embedded in a sphere that had a positive charge. (1904)

Rutherford

His model includes a dense, positively charged nucleus that contains at least one proton, with the electrons moving around it. The discovery of the nucleus is the result of his famous gold foil experiment. (1911)

Bohr

His Model is based on his theory that electrons move in fixed circular orbits that are equally spaced around the nucleus. (1913)

Schrödinger

In his model there is no definite position of the electrons around the nucleus. He developed mathematical equations to describe the probability of an electron’s location. (1926)

James Chadwick

He confirms a neutral subatomic particle that is located in the nucleus of an atom and that it had mass equal to a proton (1932)

Democritus

He theorized that the world is made up of tiny particles that couldn’t be broken down further and called atoms meaning indivisible (460-370 BC)

Modern quantum

Extending the electron cloud model to 3 dimensional space, it now includes dense, barbell regions where it is most likely to find an electron.

Atom

The smallest unit of an element that can still be identified as that element

Nucleus

The small and dense center of the atom. Contains the protons and neutrons

Electron Cloud

Surrounds the nucleus and contains the electrons. Also called the shell or energy level

Atomic number

The number of protons in the nucleus of every atom of a particular element. Determines its identity

Chemical symbol

The abbreviation given to an element. Some times they Represent their latin name and not their english

Element Name

Name of the element usually at the bottom of the element box

Atomic mass

The average mass of an element’s atoms. To find the mass, add the number of protons to the number of neutrons.

Whos Model is this

Thomson

Whos model is this

Rutherford

Whose model is this

Bohr

whose model is this

Schrödinger

What is this

Electron cloud

What is this

Electron

What is this

Proton

What is this

Neutron

What is this

Nucleus

What is this

Atomic Number

What is this

Chemical Symbol

What is this

Element Name

What is this

Atomic mass