Q3L3 models of atom and sub atomic particles

cells

tiny building blocks in the body yet these are not the tiniest particles in this world

atoms

these are building blocks of matter that make up everything that exists in our world

400 BC

democritus thought matter could not be divided indefinitely

350 BC

aristotle modified an earlier theory that matter was made of four elements; water, air, fire, earth

john dalton

was born september 6, 1766 at eaglesfield, cumberland, england.

john dalton

he was an english chemist, physicist, and meteorologist

john dalton

is best known for introducing the atomic theory into chemistry and for his research into color blindness sometimes referred to as daltonism in his honor

isotopes

different numbers of neutrons, thus different mass numbers

joseph john thomson

british physicist and nobel laureate in physics

joseph john thomson

he discovers the electron, a negatively charged particles. he characterized electron by proving that it has a negative e;ectrical charge

raisin-bread

attempted to predict number of electrons using electrostatic forces

ernest rutherford

was born august 30, 1871, at cambridge, cambridgeshire, england.

ernest rutherford

a new zealander designed an experiment to study how alpha particles, with +2 charge, interact with a piece of gold foil

ernest rutherford

he dies on october 19, 1937

nuclear model

states that the atom consists of a dense positive center called nucleus that is orbited by negatively charge electrons

james chadwick

in 1932, he discover the uncharged neutrons in the nucleus

niels henrik david bohr

was a danish physicist was born october 7, 1885

niels henrik david bohr

made foundational contributions to understanding atomic structure and quantum theory for which received the nobel prize in physics in 1922

Niels henrik David Bohr

Was also a philosopher and a promoter of scientific research

Niels henrik David Bohr

He visualized the election as rotating in orbits around the nucleus like the planet rotating around the sun

Electron

Negatively charge particles and are electrically attracted to positively protons

Protons

These are positively charges

Eugene Goldstein

A German scientist, was the first to observe the existence of protons

Number of protons

Represents the atomic number of the element's atom

In 1932, he discovered the third major subatomic particle

James Chadwick

Neutron

This particle bears neither a positive nor a negative charge

Electron

Is negatively charged particle that can occupy a volume of spare (orbital) around an atomic nucleus

Neutron

Is an uncharged particle of the nucleus of all atoms except hydrogen

Subatomic particles

These particles are responsible for the atomic number, atomic mass, and the reactions that any molecule undregoes

Atomic number

Is described as a unique, distinctive number of protons of an element. it also represents the number of electrons in the same element. Serves as the "numeric identity the element

Mass number

Pertains to the sum of the numbers of protons and neutrons in an atom