Structure of Atom

Front

What does the word 'atom' mean in Greek?

Back

Indivisible or uncuttable.

Front

Who first proposed the idea that matter is made up of tiny particles called Atomos?

Back

Democritus.

Front

What are the three subatomic particles that make up an atom?

Back

Electrons, protons, and neutrons.

Front

What is Dalton's atomic theory?

Back

Atoms combine in specific proportions based on mass, cannot be created or destroyed, and all atoms of the same element are identical.

Front

What did J.J. Thomson discover about atoms?

Back

Atoms contain small particles (electrons) and can be divided into smaller substances.

Front

What is the Plum Pudding Model?

Back

A model where electrons are mixed throughout the atom, resembling soft blobs of matter.

Front

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

Back

Atoms have a small, dense, positively charged nucleus surrounded by negatively charged electrons.

Front

What is the significance of the gold foil experiment conducted by Rutherford?

Back

It demonstrated that most of the atom is empty space and led to the discovery of the nucleus.

Front

What is the charge of protons and where are they located?

Back

Protons have a positive charge and are located in the nucleus.

Front

What is the mass number of an atom?

Back

The sum of the number of protons and neutrons in the nucleus.