2.4 The structure of atoms

• Scheikunde
• Middelbare school
• vwo
• Leerjaar 3

Hello 3 TVS

Today's planning

- Homework from last time

- Explaining today's exercize

- Today's exercize

-Isotopes

Let's go back in time

to 1808...

John Dalton 

thought.....

Thompson thought differently

In 1904 he proposed

A ball with small charged balls within it. 

Rutherford thought.

The nucleus

Protons     Neutrons

and 

The electron cloud

Niels Bohr made a small correction

There is no such thing as an electron "cloud"! The electrons are located within layers!

All elements in the periodic table have a unique amount of protons, neutrons and electrons

Isotopes

Isotopes are different types of the same atom.

Hydrogen can have

1 proton, 1 electron and 1 neutron

OR

1, proton, 1 electron and 2 neutrons 

The Isotopes of Hydrogen

Same amount of protons and electrons

so it behaves the same. 

it is just has more mass when it has an extra neutron.

Protons and neutrons determine the mass of an atom

elektrons are SO LIGHT, that the do not influence mass

The number of protons within an atom is equal to its Atomic number

Back to work!

- TEST NEXT WEEK!! Questions????

Homework:

52, 55, 59, 60, 63, 64, 69, 70