Atom History

Who came up with this model?

• Dalton

• Thomson

• Rutherford

• Bohr

In Bohr's model electrons are....

• ...dispersed in a positive soup

• ...evenly spaced around the nucleus

• ...found at different energy levels

• ...found in clouds surrounding the nucleus

Tags

NGSS.HS-PS1-2

Which scientist saw the atom as a solid sphere?

• Dalton

• Thomson

• Rutherford

• Bohr

What Greek philosopher first spoke about the idea of an atom?

• Democritus

• Dalton

• Thompson

• Rutherford

Who was Democritus?

• An Ancient Greek philosopher who believed all matter was made up of tiny particles called atoms

• An Ancient Greek philosopher who believed in four elements: earth, air, fire, and water

• Lived in the 1800s and came up with the first atomic theory

• Conducted an experiment with a cathode ray and made the plum pudding model

What Democritus think about atoms?

• He did not believe in atoms.

• He thought atoms were solid balls.

• He thought they were indivisible and that they made up all matter.

• He thought they were composed of negatively charged particles in a positively charged field.

Who was the first contributor to the atomic theory?

• John Dalton

• Ernest Rutherford

• JJ Thompson

• Democritus

• Neils Bohr

What is the correct order of scientists in order of their work related to the atomic theory from earliest to most recent?

• Neils Bohr, Ernest Rutherford, JJ Thomson, John Dalton, & Democritus

• JJ Thomson, John Dalton, Neils Bohr, Ernest Rutherford, & Democritus

• Democritus, John Dalton, JJ Thomson, Ernest Rutherford, and Neils Bohr

• John Dalton, Neils Bohr, JJ Thomson, Democritus, & Ernest Rutherford

What was JJ Thomson responsible for finding?

• protons

• neutrons

• nucleus

• electrons

What is Niels Bohr responsible for discovering?

• That electrons are inside the nucleus

• That electrons are in fixed orbits around the nucleus

• That electrons are small

• That electrons are negative