1. The Atom
CHAPTER 26

2. The Atom
An Atom is the smallest part of an element which has the properties of that element.

3. Name of particle Situated Relative Mass Charge
Structure of the Atom
Sub Atomic Particles
The atom is made up of three sub-atomic particles, the proton the neutron and the electron.
Name of particle Situated Relative Mass Charge
Proton Nucleus amu
Neutron Nucleus amu
Electron Electron cloud /

4. The Proton and the Neutron are found in the nucleus of the atom and the electrons are located in the electron cloud surrounding the nucleus.
The electron is much smaller than the proton or neutron

5. What makes atoms different?
Each atom is different because each atom has its own number of protons in its nucleus.
The atomic number of an atom is the number of Protons in the nucleus of the atom.

6. From the information given we can draw an atom.
The atom of aluminium has:
13 Protons and 13 electrons(from the atomic number)
= 14 Neutrons(Mass number - atomic number)

7. Draw an atom of Carbon

8. Draw an atom of Argon

9. Isotopes
Isotopes are atoms of the same element, which have different numbers of neutrons.
Examples of Isotopes are: