World of the Atom... Matching

Greek atomist

Thought all things were made up of small, indivisible particles called atoms

Just a dot

Rejected Democritus' theory

Believed all things were infinitely divisible and composed of one substance called Hyle.

• Laws of attraction and repulsion
• As distance increases the electrical force decreases

Showed the relationship between force of charged particles and the distance separating them.

Studied closed systems and chemical reactions.

Law of conservation of matter (matter can be changed, but cannot be created or destroyed)

Specific substances always contain elements in the same ratio by mass.

known as law of definite proportions

Rediscovered the idea of the atom

• Atoms of different elements were not the same
• Atoms of one element were exactly alike
• Atoms can join together to form compounds

Developed the periodic table of elements

Accidentally discovered that uranium ores emit invisible rays that for photographic plates

• Discovered atoms are divisible
• Discovered electrons using a cathode ray tube
• Plum pudding or raisin bread model.

• Had idea of quanta...
• Energy is not given off continuously, but in small packets called quanta

Mathematically determined that light was made up of perticles that had discrete energies.

Called these particles photons

Discovered the numerical charge of the electron

Discovered the nucleus

developed a model that had a positively charged nucleus surrounded by electrons.

Created a model that had a positively charged nucleus surrounded by electrons in defined orbits around said nucleus.

Particles with discrete energies that made up light.

Trampoline

• High energy- purple/violet/blue
• Low Energy- red

A type of metter that cannot be chemically broken down

The smallest particle of an element that posses the properties of that element

A compound made up of two or more elements

Two or more elements combined by chemical bonds.

Electrons

Electrons

Electrons

Electrons

Electrons

Electrons

Protons

Protons & Neutrons

Protons & Neutrons

Protons

Protons & Neutrons

Protons

Neutrons

Neutrons

Neutrons

Proposed that electrons have the properties of waves

• Developed the uncertainty principle
• It is impossible for us to know simultaneously both the exact location and momentum of the electron in space

incorporated the particle and wave-like behavior of the electron... known as a wave function.

Relative average of the masses of the isotopes of an element

Atoms that have the same number of protons but different numbers of neutrons.