3 - Challenge (Chapter 4 Section #1)

Front

What is the Planetary model of the atom?

Back

The Planetary model, proposed by Niels Bohr, describes the atom as having a central nucleus surrounded by electrons that orbit in defined paths, similar to planets orbiting the sun.

Front

Who proposed the idea that atoms are small, dense, solid spheres?

Back

John Dalton proposed that atoms are small, dense, solid spheres, which was a foundational concept in atomic theory.

Front

What is the nucleus of an atom?

Back

The nucleus is the positively charged center of an atom, containing protons and neutrons, and was named by Ernest Rutherford.

Front

List the atomic models in order from earliest to latest: Dalton, Thomson, Rutherford.

Back

The correct order is: Dalton (C), Thomson (B), Rutherford (A).

Front

Who discovered the nucleus of the atom?

Back

Ernest Rutherford is credited with the discovery of the nucleus of the atom.

Front

What did J.J. Thomson discover about the atom?

Back

J.J. Thomson discovered the electron and proposed the Plum Pudding model, which suggested that atoms are made of a positively charged 'soup' with negatively charged electrons embedded in it.

Front

What is the significance of Democritus in atomic theory?

Back

Democritus was one of the first philosophers to propose that matter is made up of small, indivisible particles called atoms.

Front

What is the Plum Pudding model?

Back

The Plum Pudding model, proposed by J.J. Thomson, describes the atom as a sphere of positive charge with negatively charged electrons scattered throughout.

Front

What did Rutherford's gold foil experiment demonstrate?

Back

Rutherford's gold foil experiment demonstrated that atoms have a small, dense nucleus at their center, leading to the rejection of the Plum Pudding model.

Front

What are protons and neutrons?

Back

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