PS 5.1 atomic history

Front

Who proposed the Plum Pudding Model of the atom?

Back

J.J. Thomson proposed the Plum Pudding Model.

Front

What particle did J.J. Thomson discover?

Back

Electrons.

Front

What is the main idea of Dalton's Atomic Theory?

Back

All elements consist of atoms that cannot be divided.

Front

What did Niels Bohr contribute to atomic theory?

Back

He created a model of the atom with electrons moving around the nucleus in fixed orbits.

Front

What does the term 'atom' refer to?

Back

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

Front

What is the significance of the Rutherford model of the atom?

Back

It introduced the concept of a nucleus at the center of the atom.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.

Front

What does the term 'nucleus' refer to in atomic structure?

Back

The central part of an atom, containing protons and neutrons.