History of the Atom

Physical Science Sem 2

I performed the gold foil experiment

Ernest Rutherford

I was given credit for discovering the electron

JJ Thomson

I developed a model of the Atom where electrons orbited around the nucleus, like planets around the sun. This only really worked for the hydrogen atom

Niels Bohr

I believed the Atom resembled a spherical ball (2)

Democritus and John Dalton

I performed the cathode ray tube experiment

JJ Thomson

I proposed a theory that all matter is made of atoms, which cannot be divided

John Dalton

I developed a method for accurately measuring the relative mass of atoms

Stanislao Cannizzaro

I thought that all matter was made of 1 of 4 elements, earth, fire, water, air

Aristotle

I developed the modern periodic table

Henry Moseley

I developed the plum pudding model to explain the Atom

JJ Thomson

I was given credit for discovering the neutron

James Chadwick

I discovered the nucleus of the atom

Ernest Rutherford

I am an early philosopher who was given credit for naming the Atom as he thought they were indivisible. He called them atomos

Democritus

I developed the 1st periodic table, which was based on increasing atomic mass

Dmitri Mendeleev

I was given credit for discovering the proton

Ernest Rutherford

The 3d region around the nucleus where electrons are most likely located

Orbital

A dense positively charged mass located in the center of the atom

Nucleus

Anything that has mass and occupies space

Matter

Smallest part of an element that keeps the properties of the element

Atom

A fixed circular path that an electron takes around a nucleus of the atom

Orbit

Daltons Atomic Theory

all matter is made of atoms that are indivisible and indestructible, all atoms of the same element are similar in size and chemical properties, atoms cannot be created nor destroyed, atoms can be combined in simple whole number ratios to create chemical compounds