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He published his periodic table in the Journal of the Russian Chemical Society in 1869
Dmitri Mendeleev
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These three elements were discovered 15 years after their spots had been predicted on the first published periodic table.
Gallium, scandium, and germanium
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A row on the periodic table.
Period
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A column on the periodic table.
Group
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Groups 1, 2, and 13-18
Representative elements
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Groups 3-12
Transition elements
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Elements placed below the periodic table.
Inner transition metals
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Properties of metals
Solid (except for mercury), mostly high melting points, has luster, is a good conductor of heat and electricity, is malleable, and is ductile.
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Properties of nonmetals.
Mostly gases or brittle solids, poor conductors of heat and electricty, and many are essential for life.
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Properties of metalloids.
Shares some with nonmetals and metals.
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The International Union of Pure and Applied Chemistry (IUPAC) naming system
Newly synthesized elements are given a temporary name which, once verified, can be given a permanent name by the discoverers.
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Group 2
Alkaline earth metals
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Group 13
The boron familty
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Group 14
The carbon group
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Group 15
The nitrogen group
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Group 16
The oxygen family
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Group 17
The halogen group
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Iron, cobalt, and nickel have such similar properties, such as magnetic properties, that they are known as this.
The iron triad
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First series of inner transition elements
Lanthanides (also known as rare earths because they are found one at a time)
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Second series of inner transition elements
Actinides
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Properties of alkali metals
Silvery soilds, low densities, low melting points, and increase in reactivity as you move from top to bottom on the periodic table.
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Properties of alkaline earth metals
Each element is denser and harder and has a higher melting point that the alkali metal in the same period. Active, but not as active as akali metals.
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Properties of the boron family
All metals (except boron, a brittle, black mettaloid)
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Properties of the carbon group
1 nonmetal, 2 metalloids, 2 metals
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Properties of the nitrogen group
2 nonmetals, 2 metalloids, 1 metal
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Properties of the oxygen family
3 nonmetals, 2 metalloids
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Properties of the halogen group
All nonmetal (except astatine, a radioactive metalloid), reacts with alkali metals to form salts
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Properties of noble gases
Rarely combined, found only uncombined in nature, all gases
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Properties of transition metals
Mostly found combined in ores, higher melting points
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Properties of lanthanides
Soft metals, can be cut with a knife, very similar to each other, not that rare
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Properties of actinides
radioactive, most are synthetic
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The scientist who attempted to organize elements with the Law of Triads in 1829
Dobereiner
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The scientist who ordered the elements in order of increasing atomic mass with the Law of Octaves
Newlands
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Most abundant element in earth's crust
Oxygen
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The chemical reaction where two or more substances combine to form one compound.
Synthesis
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The chemical reaction where one substance breaks down into two or more elements or compounds.
Decomposition
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The chemical reaction where one or more elements replace one another.
Replacement reactions
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