Flashcard History of the Atom

Front

Who proposed a model with electrons moving in specific layers?

Back

Bohr proposed the Bohr model of the atom, which describes electrons moving in specific orbits or layers around the nucleus.

Front

Who is 'responsible' for the 2000-year 'Death of Chemistry'?

Back

Aristotle is often credited with the 2000-year 'Death of Chemistry' due to his incorrect theories about matter and elements.

Front

What does the term 'atom' mean?

Back

The term 'atom' comes from the Greek word 'atomos', meaning 'indivisible', referring to the smallest unit of matter.

Front

Who discovered the electron?

Back

J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays.

Front

What did Rutherford discover in his experiment?

Back

Ernest Rutherford discovered the nucleus of the atom through his gold foil experiment, demonstrating that atoms have a dense central core.

Front

What is the significance of the Bohr model?

Back

The Bohr model introduced the idea of quantized energy levels for electrons, which was a significant advancement in atomic theory.

Front

What was Aristotle's view on matter?

Back

Aristotle believed that matter was continuous and made up of four elements: earth, water, air, and fire, which hindered the development of modern chemistry.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons, and is responsible for most of the atom's mass.

Front

What are protons and neutrons?

Back

Protons are positively charged particles found in the nucleus, while neutrons are neutral particles that also reside in the nucleus.

Front

What is the charge of an electron?

Back

Electrons have a negative charge, which is equal in magnitude but opposite in sign to the charge of protons.