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The horizontal rows are called periods, there are 7.

The vertical rows are groups and there are 18.

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When elements are arrange in order of increasing atomic no is called?

The Periodic Table of Elements.


Which value is used to arrange the elements in the periodic table?

atomic weight


In what order did Mendeleev arrange the elements in the first periodic table?

Mendeleev arranged the elements in the periodic table according to their atomic masses.


What are the order of elements on the periodic table based on?

the elements in the modern periodic table are arrange in the increasing order of their atomic numbers.


How did he arrange similar elements on the periodic table?

In Mendeleev's periodic table the elements are arranged in increasing atomic mass and repeating properties whereas in in the modern periodic table the elements are arranged in increasing atomic number and repeating properties.


How did Mendeleev arrange the known element in his periodic table?

He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.


How does the modern periodic table arrange the elements?

In the modern version of the periodic table, the elements are arranged in increasing order of the atomic number. The chemical properties of an element can be predicted by its group. For example group 1 elements react violently to give away one electron to form +1 ions where group 18 elements are inert in standard temperature and pressure. This periodic table was introduced by Henry Mosley.


How is the periodic table used to arrange the elements?

The periodic table used to be arranged by increasing atomic mass. Now, it is arranged by increasing atomic number (number of protons in an atom of element).


Who created or founded the periodic table?

Henry Moseley founded modern periodic table. He proved that atomic number is the fundamental property to arrange the elements.


Mendeleev arranged his periodic table into horizontal rows by what criteria?

Atomic Mass. Later on, we discovered that the transition metals did not always have the same mass, which made it difficult to rely on is periodic table. we now arrange it by atomic number.


Who used atomic mass to arrange the periodic table?

Mendeleev used atomic mass to arrange periodic table.He gave his model in 1869.


How did Mendeleev arrange chemical elements?

He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.