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The Periodic Table September 29, 2015
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Learning Target
• I must know/be able to: Interpret the arrangement of the Periodic Table, including groups and periods, to
explain how properties are used to classify elements.
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The Periodic Table
• An ELEMENT is a substance that cannot be separated into simpler substances by physical or chemical means. An element is already in its SIMPLEST form.
• The smallest piece of an element that still has the properties of that element is called an ATOM.
• An element is a PURE substance, containing only one kind of ATOM.
• The PERIODIC TABLE is a list of all the elements that have been discovered and named, with each element listed in its own element square.
• Elements are represented on the Periodic Table by a one or two letter symbol, and its name, atomic number and atomic mass.
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What’s in the square?
Atomic Number
Chemical Symbol
Element Name
Atomic Mass
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Groups and Periods
Groups
The vertical (up-and-down) columns indicate the 18 different GROUPS or chemical FAMILIES of the periodic table, usually numbered 1 through 18, from left to right. The elements within each group have the same general CHEMICAL PROPERTIES, REACTIVITY and the same number of VALENCE ELECTRONS in the Bohr Model outer electron “shell.”
Periods
The horizontal (left-to-right) rows of the periodic table are called PERIODS. There are seven periods in the periodic table. Within each period, all elements have the same number of ELECTRON SHELLS (also called electron energy levels or orbitals).
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The Periodic Table & Atomic Structure
• The elements are listed on the Periodic Table in FROM LEAST TO GREATEST, starting at the upper left corner and then moving from the left to right and top to bottom, just as the words of a paragraph are read.
• The element’s ATOMIC NUMBER is based on the number of protons in each atom of that element. In electrically neutral atoms, the atomic number also represents the number of ELECTRONS in each atom of that element.
• For example, the atomic number for neon (Ne) is 10, which means that each atom of neon has 10 protons and 10 electrons. Magnesium (Mg) has an atomic number of 12, which means it has 12 protons and 12 electrons.
• The element’s ATOMIC MASS as shown on the periodic table, is the average sum of protons and neutrons in each atom of that element. It is the decimal number found at the bottom of the element square.
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Metals, Non-Metals, Metalloids
• Metals are found TO THE LEFT OF THE STAIRCASE
• Metalloids are found ON THE STAIRCASE
• Non-Metals are found TO THE RIGHT OF THE STAIRCASE
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Characteristics of Metals
Luster (shiny)Conductor of Heat and Electricity
Ductile
Solids at Room Temperature
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Characteristics of Non-Metals
Dull/ Not ShinyInsulators
Brittle/ Non-Malleable
Liquid or Gas at Room Temperature
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Characteristics or Metalloids
Characteristics or Both Metals and Non-Metals
Semi-Conductors:Slow down energy flow
Often used in computers and other electronic devices
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The Periodic Table
• The Periodic Table is organized like a big grid. Each element is placed in a specific location because of its atomic structure. As with any grid, the periodic table has rows (left to right) called periods and columns (up and down) called groups.
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Spiral Review
Atomic Mass = Protons + Neutrons
Located within the nucleus!!!
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Chemical Symbol
The letters designated to represent a particular element
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To Find Neutrons
To Find the Number of Neutrons:
Round the atomic mass to the nearest whole number
Subtract the ATOMIC NUMBER (# of protons) from the atomic mass
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Periodic Table Graphic
1. Alkali Metals2. Alkaline Earth Metals3. Metalloids4. Non-Metals5. Metals6. Noble Gases7. Halogens8. Eighteen Groups (columns)9. Seven Periods10. Transition Metals
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Homework
Use your periodic table to fill in the information missing from your periodic table graphic.
Finish periodic table license plates.
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Activity
Use your newfound knowledge of the Periodic Table to work with your group to find the
answer to the clues provided. You MUST use your periodic table to complete the activity.