Atomic Structure

Atomic Structure

What are the 3 major parts of an atom?

• Proton

• Neutron

• Electron

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 of an Atom

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

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

• 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

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

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 Atomic Number?

• Atomic Number is the number of protons found in the nucleus of an atom.

• Typically found above the Element Symbol on the periodic table.

What is Atomic Mass?

• Atomic Mass is the weight in grams of one mole of that atom.

• Atomic Mass is found by adding together the number of protons and neutrons

• Typically found at the bottom of the atom box on the periodic table.

Example

Atomic NumberSymbolNameAtomic Mass

Atomic number equals the number of Protons_ or ___Electrons____.

Atomic mass equals the number of ____Protons + Neutrons_______.

Mass – Protons = Neutrons

Describe Isotope

Atoms that have the same number of protons but different numbers

of neutrons

Describe Isotope

Example:

http://education.jlab.org/glossary/isotope.html

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.

For more information, click here:

http://regentsprep.org/Regents/physics/phys05/catomodel/cloud.htm

What is the Electron Cloud Model?Diagram 1:

What is the Electron Cloud Model?Diagram 2: