PS 5.1 atomic history

Front

Who was the first contributor to the atomic theory?

Back

Democritus

Front

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

Back

Atoms

Front

Which scientist saw the atom as a solid sphere?

Back

Dalton

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 (layers).

Front

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

Back

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

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What did John Dalton propose about atoms?

Back

He proposed that all matter is made of atoms, which are indivisible and indestructible.

Front

What did JJ Thomson discover?

Back

He discovered the electron and proposed the 'plum pudding' model of the atom.

Front

What is Ernest Rutherford known for?

Back

He conducted the gold foil experiment and discovered the nucleus of the atom.

Front

What did Neils Bohr contribute to atomic theory?

Back

He proposed that electrons move in fixed orbits around the nucleus.