Atomic Theory and Law of Definite Proportions

What were John Dalton three contributions to atomic history?

• Created the atomic theory

• Discovered that the atom is mostly empty space

• Believed that atoms of a given element are identical

• Hypothesized that the atom is a tiny, hard sphere

• Believed that the universe was made of tiny "uncuttable" particles

Tags

NGSS.HS-PS1-7

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

Who developed the atomic theory? (a)  

• Dalton

• Thomson

• Chadwick

• Rutherford

What scientist first developed 4 rules for atomic theory, and helped kick start modern chemistry?

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

Tags

NGSS.HS-PS1-7

During the __________ scientists began to develop a theory as to how atoms work.

• 1600s

• 1700s

• 1800s

• 1900s

Who was the first contributor to the atomic theory that described the atom as "indivisible"?

• John Dalton

• Ernest Rutherford

• JJ Thompson

• Democritus

• Neils Bohr

What is Neils Bohr's contribution to the atomic theory?

• Created the atomic theory

• Created a model of the atom with electrons moving around the nucleus in a fixed orbits

• Discovered that the proton had a positive charge

• Believed that atoms of a given element are identical

• Discovered the electron

Tags

NGSS.HS-PS1-1

Which scientist saw the atom as a solid sphere?

• Dalton

• Thomson

• Rutherford

• Bohr

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

• Atoms

• Parts

• Molecules

• Hydrogen