Ch. 4 - Atom History

Front

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

Back

Atoms

Front

This number gives the number of protons in each atom of an element.

Back

Atomic number

Front

What did James Chadwick discover?

Back

Neutrons

Front

Thomson discovered the existence of what particle?

Back

Electrons

Front

Which model of the atom proposed that atoms were positive spheres with negative electrons in them?

Back

Plum Pudding Model

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

Who proposed the Planetary Model of the atom?

Back

Niels Bohr

Front

What is the charge of a proton?

Back

Positive

Front

What is the charge of an electron?

Back

Negative

Front

What is the nucleus of an atom?

Back

The central part of an atom containing protons and neutrons.