Introduction to the Modern Concept of Atomic Structure
I. VIDEO ON THE MODERN CONCEPT OF ATOMIC STRUCTURE
A. What's the Difference Between Mass Number and Atomic Mass
B. Practice Problems: Net Charge, Mass Number, Atomic Number
II. NOTES ON THE MODERN CONCEPT OF ATOMIC STRUCTURE
An element in the Periodic Table is typically presented in the format below
ATOMIC NUMBER = Number of protons
ATOMIC SYMBOL= short hand symbol for an
element
ATOMIC MASS= average mass of the all
the isotopic forms of an
element.
In order to specify a particular isotopic form of an element, scientists use the following notation
or the standard format being
MASS NUMBER= number of protons and neutrons
ATOMIC NUMBER= number of protons
By having this information, one can calculate the following characteristics of an isotopic form an element
number of protons, neutrons, and electrons
mass number
atomic number
III. EXERCISES ON THE MODERN CONCEPT OF ATOMIC STRUCTURE
Click here for the answers