Atomic Theory

Front

Who discovered the electron?

Back

Thomson

Front

What is the first atomic theory?

Back

Dalton proposed that all matter is made of atoms, which are indivisible and indestructible.

Front

Which of Dalton's theories is incorrect?

Back

All atoms are identical.

Front

What is the mass of a proton?

Back

1 amu

Front

What are subatomic particles with a negative charge?

Back

Electrons

Front

What is an atom?

Back

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

Front

What are protons?

Back

Positively charged subatomic particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral subatomic particles found in the nucleus of an atom.

Front

What is the nucleus of an atom?

Back

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

Front

What is atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element.