Atomic Structure

Mrs. Scott- IMMS

How Far Away?

• On a piece of paper, make a small circle no bigger than a dime. This represents the nucleus.

• Measure the diameter of the circle in centimeters.

• Now predict where the outer edge of this model atom would be. Would it be within the edges of the paper? The desk? The room? The school?

How Far Away?

• The diameter of an actual atom can be 100,000 times that of it’s nucleus.

• Calculate the diameter of your model atom.

What are the 3 major parts of an atom?

What are the 3 major parts of an atom?

• Proton • Neutron • Electron

Draw a diagram showing the location of each part of the atom.

Draw a diagram showing the location of each part of the atom.

http://www.eskom.co.za/nuclear_energy/fuel/fuel.html

Draw a diagram showing the location of each part of the atom.

See more diagrams at: http://www.bmb.psu.edu/courses/bisci004a/chem/basechem.htm

Draw a diagram showing the location of each part of the atom.

http://www.bmb.psu.edu/courses/bisci004a/chem/atoms.jpg

Draw a diagram showing the charges of each part of the atom.

Atomic Particle Charges

Draw a Diagram of an Atom

Draw a diagram showing the charges of each part of the atom.

Describe Proton

Describe Proton

• Protons are positively charged particles found in the atomic nucleus. Protons were discovered by Ernest Rutherford..

• Experiments done in the late 1960's and early 1970's showed that protons are made from other particles called quarks. Protons are made from two 'up' quarks and one 'down' quark.

Describe Neutron

Describe Neutron

• Neutrons are uncharged particles found in the atomic nucleus. Neutrons were discovered by James Chadwick in 1932.

• Experiments done in the late 1960's and early 1970's showed that neutrons are made from other particles called quarks. Neutrons are made from one 'up' quark and two 'down' quarks.

Describe Electron

Describe Electron

Electrons are negatively charged particles that surround the atom's nucleus. Electrons were discovered by J. J. Thomson in 1897.

Electrons determine properties of the atom. Chemical reactions involve sharing or exchanging electrons.

Describe Nucleus

Describe Nucleus

The nucleus is the central part of an atom. It is composed of protons and neutrons.

The nucleus contains most of an atom's mass.

It was discovered by Ernest Rutherford in 1911.

What is the Electron Cloud Model?

What is the Electron Cloud Model?

Model of the atom pictures the electrons moving around the nucleus in a region called an electron cloud.

The electron cloud is a cloud of varying density surrounding the nucleus. The varying density shows where an electron is more or less likely to be. Atoms with electrons in higher energy levels have additional electron clouds of different shapes that also show where those electrons are likely to be.

Electrons have a negative charge and are much, much smaller that protons or neutrons.

What is the Electron Cloud Model?Diagram 1:

What is the Electron Cloud Model?Diagram 2:

Videos

• Atoms- Study Jams

• Atoms- Brain Pop

• Atomic Models- Brain Pop

• Chemistry 4 Kids