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Take silicon for example. On its own, silicon is a poor conductor of electricity. However, when it’s mixed with some boron, it becomes a great conductor of electricity.

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Metalloids have similar properties to those of metals and non metals; however, metalloids have the capability to (under certain circumstances) behave like a metal or a non metal.

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80% of the periodic table is metals.
They are found in the middle, left, and bottom of the table.

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How do elements change as you move from left to right within a row on the periodic table? 

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How do elements change as you move from left to right within a row on the periodic table? 

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They become less metallic and more nonmetallic

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He organized his periodic table in order of increasing atomic mass

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How does IUPAC organize columns in the periodic table?

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How does IUPAC organize columns in the periodic table?

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By labeling groups as numbers 1-18 going from left to right

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The elements that are metalloids are: boron, silicon, germanium, arsenic, antimony, tellurium, and astatine.

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Scientists needed a way to organize the elements so they know when they have discovered all the elements

Early chemists used the properties of elements to sort them into groups

The periodic tables were organized into triads which are groups of three elements with similar properties

Chlorine, bromine and iodine are an example of a triad

Not all eme te can be grouped into triads and dobereiner noticed a pattern which was that one element of each triad tended to have values that fell midway between those of the other two elements

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When elements are arranged in increasing atomic # their physical and chemical properties have repition

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He predicted that elements would later fill those spaces and started to predict their properties based on their location on the table.

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Nonmetals generally have properties opposite to that of metals (surprise)

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What was significant about the spaces( or question marks) on his table

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What was significant about the spaces( or question marks) on his table

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He predicted that other elements would be discovered and fill those spaces. He also predicted what their properties would be based on their locations in the table.

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How did Moseley reorganize the periodic table?

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How did Moseley reorganize the periodic table?

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By increasing atomic

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Order of increasing atomic mass

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The average of 2 elements was close to 3rd elements atomic mass

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He wrote we properties of each element on different note cards and rearranged them until he found an organization that worked.

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Not all elements could be organized into triads so it didn’t work

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80 percents of the elements on the periodic table are metals.
You mostly find them in the transition metals on the periodic table
They are good conductors of heat and electricity, it would have high luster or sheen if they are freshly cleaned or cut
They are mostly solids at room temperature except for mercury

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Triad- Bromine, Iodine, Chlorine

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In the periodic table, they’re located on the upper right side (except for hydrogen because hydrogen is special)

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Describe the process he used to create his table

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Describe the process he used to create his table

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He wrote the properties of each element on a separate note card. He moved the cards around until he found an organization that worked.

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What problem is there with organizing elements by increasing atomic mass?

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What problem is there with organizing elements by increasing atomic mass?

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Elements are grouped based on properties, but with atomic masses, the elements with similar properties wouldn’t be placed in a group

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He was a Russian chemist and teacher and he was we first to arrange the elements in order of increasing atomic mass.

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Triad- set of 3 elements with similar properties specifically chemical

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Metalloids are found at the border in between metals and non metals.

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Organized into triads

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There’s so much variety among nonmetals that it’s hard to give them a set of general properties

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-Poor conductor of heat and electricity (carbon in the form of graphite is the only exception)
-Nonmetals in a solid form tend to be fairly brittle
-Majority of nonmetals are gases at room temperature (however some like sulfur and phosphorus are solids and bromine is a liquid)

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A Russian chemist and teacher, who published a table of the elements

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Scientists needed a way to organize the elements do they could answer questions about them.

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Non-Metals are one of the three classes of elements.
Properties of non-metal: There is a greater variation in physical properties among non-metals than amoung metals. Most non-metals are gases at room temperature. A few are solids. One non-metal, bromine, is a liquid at room temperature.
Different from metals: Non-metals have opposite properties of metals. Non-metals are poor conductors of heat and electric currents. Solid non-metals are brittle and they shatter easily.
Location of Non-metals: They are in the upper right corner of the periodic table.

By Emily Steinach, Addison Newman, Jessi Kresl

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The realist Metals: Callie, Christina, Savannah

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The realist Metals: Callie, Christina, Savannah

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Definition: good conductors of heat and electric current.
Freshly clean/cut piece of metal has high muster or sheen.
Sheen is caused by the metals ability to reflect light.
Solid at room temperature except mercury.
Can be drawn into wires, ductiles.
Most can be hammered into sheets without breaking and are malleable.
Properties can determine how they are used.

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~What problem is there wit organizing elements by increasing atomic mass?
They wouldn’t be place with the elements that it is similar to
~how did Mosley reorganize the periodic table?
He determined an atomic number for each known element ( in order)
~what is periodic law?
When elements are arranged in increasing atomic number, there is a periodic repetition of their physical and chemical properties.
~How does IUPAC organize the columns on the periodic table?
They numbered the groups from left to right 1 through 18
~How do elements change as you move from left to right with invisible a row on the periodic table?
Across a period, the properties of elements become less Metallica and more nonmetallic.