page 1 study guide

Vocabulary flashcards related to the historical development of the atomic model.

Democritus

Greek philosopher who conceived the term "indivisible" and proposed that everything is made of atoms.

John Dalton

English teacher who proposed that elements are made of only atoms, atoms of elements are all alike, and atoms are not indivisible.

J.J. Thomson

British physicist who discovered negatively charged particles (electrons) and created the "Plum Pudding" model.

Ernest Rutherford

New Zealand-born physicist who proposed the Nucleus model, suggesting electrons orbit a small, positively charged nucleus.

Neils Bohr

Danish physicist who developed the Planetary/Bohr model, stating that electrons orbit the nucleus and energy in orbit is related to its size.

Quantum Model

Model developed by various scientists in the 20th century, describing how electrons gain energy and jump to farther orbits when atoms are heated.

Who was Democritus?

The first person to consider that matter was made of tiny fundamental particles such as atoms.

What is necessary for a useful scientific model?

Model must be workable and provide answers to questions.

When a change of scientific models occurs, what happens to the way scientists think?

It changes.