PERIODIC TABLE

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18 Terms

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Periodic table

Shows all the elements arranged in rows and columns .

<p>Shows all the elements arranged in rows and columns .</p>
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Physical properties

Features of a substance that can be observed without changing the substance itself .

<p>Features of a substance that can be observed without changing the substance itself .</p>
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Chemical properties

Features of the way substance reacts with other substances.

<p>Features of the way substance reacts with other substances.</p>
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Groups

Columns of the periodic table.

<p>Columns of the periodic table.</p>
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Periods

Rows of the periodic table.

<p>Rows of the periodic table.</p>
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Lustrous

Shiny when cut , scratched or polished .

<p>Shiny when cut , scratched or polished .</p>
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Malleable

Easily bent or shaped .

<p>Easily bent or shaped .</p>
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Ductile

Can be turned into wires.

<p>Can be turned into wires.</p>
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Number of protons:

Protons = atomic number

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Number of electrons :

Electrons = Protons = atomic number

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Number of neutrons :

Atomic mass - atomic number = neutrons

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Atomic mass :

Atomic number + neutrons = atomic mass

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Alkali metals

Found in group 1 of the periodic table.

<p>Found in group 1 of the periodic table.</p>
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Halogens

Found in Group 7 of the periodic table.

<p>Found in Group 7 of the periodic table.</p>
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Displacement reaction

Occurs when a more reactive element displacements , or pushes out , a less reactive element from a compound that contains the less reactive element.

<p>Occurs when a more reactive element displacements , or pushes out , a less reactive element from a compound that contains the less reactive element.</p>
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Compound

Two or more separate elements in a mixture.

<p>Two or more separate elements in a mixture.</p>
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<p>Name a b c</p>

Name a b c

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<p>Who is Dmitiri Mendeleev?</p>

Who is Dmitiri Mendeleev?

He arranged the elements in order of increasing atomic mass .

He put elements into groups based on chemical properties.