Atomic Model History

Dalton proposed that atoms _____

• could be created and destroyed
• could be created but not destroyed
• could be destroyed but not created
• could neither be created nor destroyed

Tags

NGSS.HS-PS1-7

The electron was discovered in 1897.  Who discovered it?

• Ernest Rutherford
• John Dalton
• J. J. Thomson
• Niels Bohr

Whose model showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons?

• J. J. Thomson
• John Dalton
• Ernest Rutherford
• Niels Bohr

J. J. Thomson won a Nobel Prize in 1906.  Which particle did he discover?

• the electron
• the proton
• the neutron
• the photon

Whose experiment involved shooting small, positively charged alpha particles at a sheet of gold foil?

• J.J. Thompson
• Max Planck
• Ernest Rutherford
• Niels Bohr

Who concluded that atoms consisted largely of empty space with most of the mass concentrated in the center?

• J. J. Thomson
• Max Planck
• Ernest Rutherford
• Niels Bohr

Rutherford referred to the center of the atom, where the mass was concentrated, as _____

• the kernel
• the nucleus
• the focus
• the heart

Tags

NGSS.HS-PS1-8

Who stipulated that electrons orbit the nucleus at fixed energies and distances?

• Albert Einstein
• Max Planck
• Ernest Rutherford
• Niels Bohr

Soon after Bohr's planetary model took center stage, experiments showed that electrons behaved _____

• as particles but not waves
• as waves but not particles
• as both particles and waves
• as neither particles nor waves

Tags

NGSS.HS-PS4-3

Who showed it was impossible to determine both the exact position and speed of electrons as they moved around an atom?

• Werner Heisenberg
• Niels Bohr
• Max Planck
• Albert Einstein