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Answered 2013-01-15 16:11:39

There are 7 periods in the modern periodic table.

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The lanthanide and actinide rows are typically separated from the rest of the periodic table to conserve space. However, the version of the table known as the wide periodic tableincorporates these rows in the main body of the table


Primarily for convenience in viewing: If the inner transition elements were in the main body of the table, it would have to be nearly twice as wide.


The two main arrangements of the periodic table are the groups, which form the columns of the table, and the periods, which form the rows. There are some similarities between elements in the same period, but most similarities are shared within the groups of elements.


There are 18 main groups in the modern periodic table of elements.


Yes. The two main classification of elements in the periodic table are metals and nonmetals.


The main group elements of the periodic table are groups 1, 2 and 13 through 18


The three main categories of elements on the periodic table are metals, metalloids, and nonmetals.



the three main categories are non-metal, metal, and metaloid. those are the main categories of the periodic table.


The three main metals in a periodic table are transition metals, alkali metals, and alakaline earth metals.


The two bottom rows of periodic table are: Lanthanoids Actinoids They are placed separately from the main periodic table.


Alkali, Alkaline earth, Halogen, oxygen, Nitrogen, carbon are the main families in the periodic table.


Three main classes are:MetalsNon metalsTransition elementsThey are present in periodic table.


Drawbacks of modern periodic table: 1.Hydrogen resembles both the alkali metals and halogens But it has been placed with the alkalis. 2.The lanthanides and actinides have not been placed in the main body of the table. 3.Place of Multivalent elements is not sure in the modern periodic table.


limitation of modern periodic table 1 1.Hydrogen resembles both the alkali metals and halogens. But it has been placed with the alkalis. 2.The lanthanides and actinides have not been placed in the main body of the table.


8 main groupes, 10 transition metal groupes in periods 4,5,6,7 14 in lanthanides in period 6 14 in actinides in period 7


the periodic table is divided in three main sections. the section's are the metals, the non metals, and the metalloids.




Metals, non metals, transition elements belong to main periodic table. They are arranged according to atomic number.


In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.


one goes sideways and one goes up and down. its just a way to locate the elements easier


The periodic table has three main groups: metals, non-metals and metalloids. Metals are solid and conductors of electricity. Metals can be found in the left of the periodic table.


It helps organize the unorginizable.