7th Chemistry - The Periodic Table

St. George's College

Subject: 7th CHEMISTRY

Teacher's notes

Objectives

Class:

Vocabulary

The Periodic Table

Date: June 2nd

Link and Learn

Prepared by

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7th Beethoven ‐ The Periodic Table Name

Oral Intervention

Coin

Chocolate

Ariana Gabriel Andrea Abraham Giacomo Fabiana Sinead Liliam Francesca Rodrigo Andres Stefano Jean Pierre Diego Rodrigo Luis Andrea Sebastián Ivanna Camila Carlos Aarón Paola Enrique Alessandra Irma Sophia Naomi Kiara Christopher

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7th Mozart‐ The Periodic Table Name

Oral Intervention

Coin

Chocolate

Nicole Luis Luciana Antonella Valeria Ch. Valeria C. Analucía Camila Franco Ramiro Sara Alicia José Luis Sergio Roberto Giancarlo Fiorella Gabriela Steffano Javier

Roberto R. Diego Luis Fernando Sebastián Julio Sherley César Vilma Alessandra V.

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Let's remember previous learned concepts...

Wanna Play?

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Dmitri Mendeleev • In 1869, Russian scientist Dmitri Mendeleev solved the problem. He also tried putting the element in order of their atomic mass. He made a table of elements.

• New rows were started so that elements which were alike could line up together in columns. He wanted a table of regular periodic patterns.

• When the pattern began to go wrong, he left gaps in the table, arguing that those gaps were for elements not discovered yet. He even changed the order when similar elements didn't line up.

• Because Mendeleev was using atomic masses, there were still discrepancies in the table.

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6

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New knowledge beginning.....

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The Periodic Table • The Periodic Table is a classification system designed to organize elements to describe a periodic pattern.

• In other words, to organize them by similar properties.

• The current periodic table, different from the one Mendeleev proposed, is based on the Atomic Number of the elements, and not on the Atomic Mass.

• The basic parts of the periodic table are:

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Elements in the Table • The elements in the periodic table are positioned in increasing order of their Atomic Number (Z), and NOT based on their Atomic Mass (A).

• This is known as The Periodic Law. • In order to understand the periodic table, we must remember that electrons are located in levels of energy, and in probabilistic regions called orbitals.

• The orbitals are: s : holding a maximum of 2 electrons. p : holding a maximum of 6 electrons. d : holding a maximum of 10 electrons. f : holding a maximum of 14 electrons.

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"p" block "s" block

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Blocks in the Periodic Table Block "s": formed by elements from groups I (alkali metals) and II (alkaline earth metals), which are light metals with a configuration in the last electron shell of: ns1 or ns2.

Block "p": formed by the representative metals and no metals, it contains elements from groups 13 to 18.

Block "d": formed by elements from groups 3 to 12, these elements are called Transition Elements. their main characteristic is having the "d" orbital full.

Block "f": formed by the elements placed "outside" the periodic table.

They are called Lanthanoids and Actinoids. Their main characteristic is having the "f" orbital full.

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PERIODIC TABLE IA 1 1s

Transition Elements

IIA

2 2s

IIIA IVA VA VIA VIIA VIIIA

2p

VIIIB

3 3s

IIIB IVB VB VIB VIIB

4 4s

3d

4p

5 5s

4d

5p

6 6s

5d

6p

7 7s

6d

IB IIB 3p

Internal Transition Elements

4f 5f

Block "s"

Block "p"

Block "d"

Block "f"

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Periodic Properties of the Elements • The Periodic Properties of the elements, are the ones that form a pattern thanks to the distribution of elements in the periodic table according to their increasing order of atomic number.

• These are the periodic properties you have to investigate about:

ATOMIC RADII IONIZATION ENERGY ELECTRON AFFINITY ELECTRONEGATIVITY

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Resources Used Slide (Group)

Resource

Description

Origin

G1 ‐ 2

Image

Beethoven

http://bit.ly/Q7ggk

G1 ‐ 3

Image

Mozart

http://bit.ly/18LkW6

G1 ‐ 4 Image G1 ‐ 7

Images

G1 ‐ 9 Image

IS Units and Prefixes http://tinyurl.com/c9d69c Mendeleev

http://bit.ly/Pkbmw http://bit.ly/rSgUf

Groups Periods

http://bit.ly/pa98a http://bit.ly/pa98a

Newlands Octaves

http://bit.ly/11WTZv http://bit.ly/gHzPZ

G1 ‐ 9 G1 ‐ 12 Images G1 ‐ 14 Images

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Teacher's Notes This class has been designed to cover the topics of The Periodic Table from Monday June 1st till Friday June 5th.

For further knowledge about this topic: 1. Conduct a thorough search under the topic: The Periodic Table on the Web, books and magazines.

2. If findings are not specific, ask your teacher for suggestions.

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Objectives • Identify and understand the principle behind the classification of chemical elements in the periodic table.

• Understand and characterize the parts and properties of the periodic table.

Note: All, or most, of the objectives will be covered during class time, however the student must be responsible for those objectives not covered or concluded.

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Vocabulary • • • • •

Element: Atomic Number: Atomic Mass: Group: Period:

Note: Most of the vocabulary words will be covered during class time, however the student must be responsible for those words not covered or concluded.

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Link and Learn You can visit the following websites to improve your understanding on the present topic: • • • • •

http://www.chem1.com/acad/webtext/atoms/atpt‐6.html#SIZE http://www.dayah.com/periodic/ http://science‐learning2009.wikispaces.com http://learningandscience.blogspot.com http://libraryatstgeorge.blogspot.com

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Prepared by

Gerardo LAZARO Science Lead Teacher Email: glazaro@sanjorge.edu.pe Wiki: http://science‐learning.wikispaces.com Blog: http://learningandscience.blogspot.com Twitter: http://twitter.com/glazaro

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