The Periodic Table

Organizing the Elements

Dmiitri Mendeleev• What is a mark of a great scientist? Good

scientists discover new information and make sense of it, linking it to other data. They may go further by giving an explanation of this linked data which, maybe not immediately, other scientists accept as a correct explanation. However the outstanding scientist goes further in predicting consequences of his ideas which can be tested. This boldness identifies the great scientist if the predictions are later found to be accurate. One such person was Russian chemist Dmitri Mendeleev. Incidentally, although he is often regarded as the father of the Periodic Table, Mendeleev himself called his table, or matrix, the Periodic System.

Mendeleev’s First Published Periodic Table

The Modern Periodic Table

Periodic Table Features

• Arranged by increasing atomic number

• Periods - Across

• Groups - vertical

• Metals, Non-metals, metalloids– Alkali metals– Alkaline earth metals– Halogens– Noble gases

Is there a connection between the

periodic table and atomic structure?

YES!

• The most current atomic theory -

Quantum

Mechanics

The Periodic Table and Bohr’s Atomic Model – A Relationship?

• Look at the overhead showing the Periodic Table with electron configurations written in for each element. What do you notice?

Some Vocabulary for the Periodic Table

• Periods

• Groups

• s-block

• p-block

• Metals, nonmetals, and metalloids

Periodic Table Practice

• Use the periodic table to predict the electron configuration of Mg and Ca.

• Write out the electron configurations to check your prediction.

• How many valence electron are in Mg and Ca?

• Without writing out the electron configuration, can you predict how many valence electrons Ba has?

Connection

• All elements in the same group have the same number of valence electrons

Assignment

• Read 6.1 – 6.2 & 6.9 – 6.10

• Do Remaining Ch. 6 Problems

Quantized Property – can have only certain values, that is, not all values are allowed. An electron can only have specific energies.

Shell, Subshell & Orbital

• Electron Shell –n - is the region of space about a nucleus that contains electrons that have approximately the same energy and that spend most of their time approximately the same distance from the nucleus.

• Electron Subshell – is the region of space within an electron shell that contains electrons that have the same energy. (s,p,d,f)

• Electron Orbital – is the region of space within an electron subshell where an electron with a specific energy is most likely to be found.