Atomic Model--Timeline of the Atom

Front

Who proposed the first Atomic Theory?

Back

John Dalton proposed the first Atomic Theory.

Front

What particle was discovered by Joseph Thomson using a cathode ray tube?

Back

The electron was discovered by Joseph Thomson using a cathode ray tube.

Front

What term did Democritus use to describe the indivisible particle of matter?

Back

Democritus called the indivisible particle of matter 'atomos'.

Front

What did Ernest Rutherford discover about the structure of the atom?

Back

Ernest Rutherford discovered that atoms were mostly empty space.

Front

In the modern atomic model, where are electrons found?

Back

Electrons are found in regions called orbitals.

Front

What is the significance of John Dalton's Atomic Theory?

Back

John Dalton's Atomic Theory laid the foundation for modern chemistry by introducing the idea that matter is made up of atoms.

Front

What experiment did Joseph Thomson conduct to discover the electron?

Back

Joseph Thomson conducted experiments using a cathode ray tube to discover the electron.

Front

What was Democritus's contribution to the concept of the atom?

Back

Democritus contributed the idea that matter is composed of indivisible particles called 'atomos'.

Front

How did Rutherford's gold foil experiment change the understanding of atomic structure?

Back

Rutherford's gold foil experiment revealed that atoms have a small, dense nucleus and are mostly empty space.

Front

What are orbitals in the context of the modern atomic model?

Back

Orbitals are regions in an atom where there is a high probability of finding electrons.