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Strictly, Atomic Mass is not organised on the Periodic Table - the periodic table is arranged according to the atomic number (i.e. the number of protons in the nucleus) of the elements.
However, as the number of neutrons that are required in the nucleus increases as the number of protons increases, it means that with increasing atomic number you generally get a increase in atomic mass as you go further up the periodic table.
BUT, there are exceptions - for complex reasons relating to nuclear stability, the average atomic mass of cobalt (atomic number 27) is actually greater than that of nickel (atomic number 28), and the atomic mass of plutonium (atomic number 94) is greater than that of Americium (atomic number 95).
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoThe periodic table is arranged by atomic number. It has never been arranged by mass number. It was once arranged by mean atomic mass but that had inconsistencies, because for example potassium is lighter than argon.
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What is the difference between the periodic table and Mendeleev's table?
Mendeleev's table was arranged by atomic mass and the periodic table is arranged by protons (atomic number).
How were the elements in the periodic table arranged?
By Atomic Mass
How is the periodic table is organized into columns called?
The elements arranged according to their atomic number in the table are called periodic table.
How are the elements arranged in the periodic table by atomic mass or atomic number?
Atomic Number
What does the atomic number and atomic mass have to do with the arrangement of the elements on the periodic table?
The elements on the periodic table are arranged in order of increasing atomic number.
What is the difference between the periodic table and Mendeleev's table?
Mendeleev's table was arranged by atomic mass and the periodic table is arranged by protons (atomic number).
How were the elements in the periodic table arranged?
By Atomic Mass
How is the periodic table is organized into columns called?
The elements arranged according to their atomic number in the table are called periodic table.
Is the periodic table of elements arranged in increasing mass?
No. The modern periodic table is arranged in accordance to increasing atomic number and repeating properties.
What trends were seen in Mendeleev's periodic table?
he arranged his Periodic Table by each elements Atomic Mass
How are the elements arranged in the periodic table by atomic mass or atomic number?
Atomic Number
What does the atomic number and atomic mass have to do with the arrangement of the elements on the periodic table?
The elements on the periodic table are arranged in order of increasing atomic number.
Mendeleev arranged the elements in his periodic table in order of?
Mendeleev arranged the elements by increasing atomic mass instead of like today by increasing atomic number.
How was moseleys periodic table arranged?
Compared to Mendeleev's periodic table which was arranged my atomic mass, Moseley's was, however, arranged by atomic number.
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 is the scientist who recognized the periodic table for atomic number?
Dmitri Mendeleev was the scientist who arranged the periodic table according to the element's Atomic Mass. Later on, he then arranged it according to the element's Atomic Number.
Who developed periodic table?
Niels Bohr: the modern periodic table where the elements are arranged in the increasing order of atomic number Mendeleev: The periodic table where the elements are arranged in the increasing order of atomic mass
