​Isotopes are different versions of elements. They are different from the periodic table because their # of neutrons has changed.

​​Isotopes

​

Ions are versions of atoms that are charged either positively or negatively. They are different from the periodic table because their # of electrons has changed.

​Ions

APE: (in a neutral atom / on the periodic table)

       Atomic Number =

# of Protons =

# of Electrons

​

MAN: 

          Mass Number

--        Atomic Number

= # of Neutrons

​

​Mass number = protons + neutrons

​Atomic Mass = Mass given on Periodic Table

​​APE:   Atomic Number = # of Protons = # of Electrons

MAN:  Mass Number - Atomic Number = # of Neutrons

​

Look at a neutral atom of Oxygen:

How many…. What is Oxygen’s….

​

Protons? _____ Atomic Number? _____

Electrons? _____ Atomic Mass? _____

Neutrons? _____ Mass Number? _____

​​APE:   Atomic Number = # of Protons = # of Electrons

MAN:  Mass Number - Atomic Number = # of Neutrons

​

Look at a neutral atom of Silicon:

How many…. What is Silicon’s….

​

Protons? _____ Atomic Number? _____

Electrons? _____ Atomic Mass? _____

Neutrons? _____ Mass Number? _____

​​APE:   Atomic Number = # of Protons = # of Electrons

MAN:  Mass Number - Atomic Number = # of Neutrons

​

Look at a neutral atom of Scandium:

How many…. What is Scandium’s….

​

Protons? _____ Atomic Number? _____

Electrons? _____ Atomic Mass? _____

Neutrons? _____ Mass Number? _____