Atomic Theory

J.J Thomsons model of an atom, in which he thought electrons were randomly distributed within a positively charged cloud

• Bohr Model

• Plum pudding model

• Cathode Ray model

• Cloud Model

Tags

NGSS.MS-PS1-1

the number of protons in the nucleus of an atom

• neutrons

• isotopes

• atomic number

• mass number

Tags

NGSS.MS-PS1-1

1909-solar system model of the atom, gold foil experiment- fired negative ions at thin sheet of gold foil, discovered the atomic nucleus and proposed a nuclear model of the atom .

• JJ Thompson

• Ernest Rutherford

• James Chadwick

• John Dalton

Tags

NGSS.MS-PS1-1

A Greek Philosopher _____________, taught Alexander the Great, started a famous school, studied with Plato

A negatively charged ion is called _______________

_______________are the particles of the nucleus that have no charge.

1913- discovered that electrons move around the nucleus in orbits called electron shells

• Ernest Rutherford

• James Chadwick

• Niels Bohr

• JJ Thomson

Tags

NGSS.MS-PS1-1

Atoms of the same element that have different numbers of neutrons

• ions

• isotopes

• neurons

• cations

How many neutrons are in this element?

What is the atomic mass of the following element?

Tags

NGSS.HS-PS1-1