Atomic Theory and Atomic Structure

Discovered the electron within the atom

• Thomson

• Chadwick 

• Schrodinger & Heisenberg

• Dalton

Created the Planetary Model of the atom

• Bohr

• Dalton

• Rutherford

• Chadwick

Calculation used to find the number of neutrons in an atom

• Atomic Mass - Atomic Number

• Atomic Number - Atomic Mass

• Atomic Mass - Electrons

• none of these

Who stated that atoms cannot be divided?

• Democritus

• Dalton

• Thomson

• Bohr

Place the following scientists in order, from earliest to latest: 
Rutherford, Dalton, Bohr, Thomson

• Dalton, Rutherford, Bohr, Thomson

• Thomson, Dalton, Rutherford, Bohr

• Dalton, Thomson, Rutherford, Bohr

• Bohr, Dalton, Rutherford, Thomson

Arrangement of elements organized by atomic number

• Electron Cloud 

• Periodic Table 

• Electron Configuration

• None of these

Tags

NGSS.HS-PS1-1

Which scientist saw the atom as a positively charged sphere with negative particles (electrons) embedded within?

• J.J. Thomson

• Niels Bohr

• John Dalton

• Ernest Rutherford

Which scientist proposed a model of the atom in which the electrons are orbiting at different levels?

• Niels Bohr

• James Chadwick

• John Dalton

• Ernest Rutherford

Bohr's model of the atom proposed that ___.

• electrons move around the nucleus in fixed orbits

• neutrons move around the nucleus

• neutrons do not exist, but are just paired protons and electrons

• the nucleus spins

J.J. Thomson's model of the atom is given this name because he believed that electrons were spread randomly throughout a positive sphere.

• plum pudding model

• planetary model

• billiard ball model

• empty space model