1. Structure of The Atom
Not the Adam

2. Basic Structure of the Atom
A positively charge proton
A neutrally charged neutron
The negatively charged electron travels around the nucleus

3. Relative Masses of the Sub-atomic Particles
Proton has a mass of amu or 1 amu
Neutron has a mass of amu or 1amu
Electron has a mass of 5.49 x 10-4 amu
One amu equals 1.66 x 10-27kg
Atomic Mass Unit (amu) is a unit of mass equal to one-twelfth (1/12) of the mass of a carbon 12 atom.

4. The Relative Masses of the Particles

5. What is in the nucleus? The nucleus contains the
Protons – positively charged
Neutrons – neutral charged
The nucleus has a positive charge

6. Relative Size of Nucleus

7. Atomic Number
The atomic number represents the number of protons in an element
Each element has its own Atomic Number
The number of protons is what determines what type of atom.
The number of protons equals the number of electrons in an atom

8. Atomic Symbol Elements are represented by a symbol
The symbol is either one upper case letter or an upper case and a lower case O C Na Mg Si Cl
NEVER MG or NA or SI or CI

9. On periodic table Top number Symbol Atomic mass Atomic number
The bottom number

10. Atomic Mass
The atomic mass gives the mass of the protons and neutrons in an atom
The atomic mass less the atomic number gives the number of neutrons
# of Neutrons = Atomic mass-Atomic Number

11. Determine the Number of Neutrons inCa H Bi Mo O
20 neutrons
0 neutrons
126 neutrons
54 neutrons
8 neutrons

12. Atomic Weight Elements exist in different forms or isotopes in nature
Every atom of an element has the same number of protons and electrons but different number of neutrons
The atomic weight of an element listed on the periodic is the weighted average of all the naturally occurring isotopes