Front

Who discovered electrons?

Back

J.J. Thompson

Front

Who was the first contributor to the atomic theory?

Back

Democritus

Front

Democritus believed that the smallest particles were atomos, the Greek word for

Back

uncut or indivisible

Front

Who proposed that the atom consists mostly of empty space? Options: Bohr, Dalton, Rutherford, Chadwick

Back

Rutherford

Front

Which scientist saw the atom as a solid sphere? Options: Dalton, Thomson, Rutherford, Bohr

Back

Dalton

Front

Who's model is this? Options: Thomson, Rutherford, Democritus, Bohr

Back

Thomson

Front

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

Back

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

Front

What model is the current model of the atom?

Back

The Quantum Mechanical Model

Front

Who found that atoms have smaller parts and theorized that negative electrons are surrounded in a sphere of positive charges? Options: J.J. Thomson, Ernest Rutherford, Niels Bohr, James Chadwick

Back

J.J. Thomson

Front

Who is the person credited with the formation of the "plum pudding" model?

Back

Thomson