Atomic Models and Theories Extra

Arranged the elements on the periodic table based on atomic mass

• Democritus

• Dmitri Mendeleev

• Dalton

• JJ Thomson

Solid Sphere Model; elements are atoms with different masses

• Democritus

• Dmitri Mendeleev

• Dalton

• JJ Thomson

Plum Pudding Model: atom is positive sphere with negatively charged particles evenly embedded throughout

• Democritus

• Dmitri Mendeleev

• Dalton

• JJ Thomson

Tags

NGSS.MS-PS1-1

Named the atom based on the Greek word “atomos” meaning indivisible

• Democritus

• Dmitri Mendeleev

• Dalton

• JJ Thomson

Electron Cloud Model: surrounding the nucleus is an electron cloud made of shells, but electrons do not travel in a fixed orbit

• Ernest Rutherford

• Niels Bohr

• Henry Moseley

• Schrodinger and Heisenberg

• James Chadwick

Nuclear Model: Gold Foil experiment allowed him to discover that the nucleus was the positively charged center of the atom surrounded by negatively charged electrons

• Ernest Rutherford

• Niels Bohr

• Henry Moseley

• Schrodinger and Heisenberg

• James Chadwick

Discovered neutrons

• Ernest Rutherford

• Niels Bohr

• James Chadwick

Arranged the elements on the periodic table based on atomic number

• Ernest Rutherford

• Niels Bohr

• Henry Moseley

• Schrodinger and Heisenberg

• James Chadwick

Electrons travel in fixed orbits around the nucleus of the atom, like planets around sun

• Ernest Rutherford

• Niels Bohr

• Henry Moseley

• Schrodinger and Heisenberg

• James Chadwick

The location where the mass of the atom is located

• Proton

• Electron

• Neutron

• Electron Cloud

• Nucleus