1 How long does it take to write a chemistry
textbook? Now a ubiquitous sight in chemistry classrooms
everywhere, 2 the conception of this orderly arrangement
of the elements was due to the nineteenth-century Russian
chemist Dmitri Mendeleev while he was writing a
textbook on general chemistry. The basic 3 principle of
Mendeleev’s periodic order of elements have remained the
same, even as it has grown in size. This key development
in the history of science still defines our contemporary
understanding 4 of matter in today’s times.
[1] Like many scientific breakthroughs, 5 Mendeleev
was partially anticipated by the work of other scientists.
[2] For example, the French geologist Alexandre-Emile
Béguyer de Chancourtois is generally credited with
discovering periodicity—the existence of recurring trends
across 6 elements—in 1862. [3] Another key observation
was made the following year by the British scientist John
Newlands, who noted that similar elements were often
related in mass by a multiple of eight. [4] By Mendeleev’s
own account, de Chancourtois and Newlands were among
those “foremost” in research that led to the discovery of
this law. 7
While not the first scientist to attempt a
comprehensive organization of the elements, Mendeleev
did publish a paper in 1869 with the first draft of the
modern periodic table. In this table, families of elements
were arranged horizontally; however, Mendeleev
eventually revised this format to the vertical structure
found in contemporary chemistry textbooks. 8 Based
on the patterns he observed, Mendeleev suggested that the
properties of elements are a reflection of their atomic weight.
Also based on these patterns, Mendeleev made concrete
predictions about elements that had yet to be discovered.
For instance, Mendeleev predicted the discovery of two
elements analogous to aluminium and silicon; these were
later discovered to be gallium and germanium. 9 This
predictive power became one of the defining characteristics
of the periodic table.
The periodic table proposed by Mendeleev was the
culmination of many observations and discoveries— 10
unfortunately, many of his peers were reluctant to accept
his ideas. From electronegativity to electron orbitals, the
periodic table 11 anticipating many future topics of
scientific inquiry. Even today, scientists use the predictive
power of the periodic table to generate new hypotheses and
design experiments that further expand our understanding
of the universe.
textbook? Now a ubiquitous sight in chemistry classrooms
everywhere, 2 the conception of this orderly arrangement
of the elements was due to the nineteenth-century Russian
chemist Dmitri Mendeleev while he was writing a
textbook on general chemistry. The basic 3 principle of
Mendeleev’s periodic order of elements have remained the
same, even as it has grown in size. This key development
in the history of science still defines our contemporary
understanding 4 of matter in today’s times.
[1] Like many scientific breakthroughs, 5 Mendeleev
was partially anticipated by the work of other scientists.
[2] For example, the French geologist Alexandre-Emile
Béguyer de Chancourtois is generally credited with
discovering periodicity—the existence of recurring trends
across 6 elements—in 1862. [3] Another key observation
was made the following year by the British scientist John
Newlands, who noted that similar elements were often
related in mass by a multiple of eight. [4] By Mendeleev’s
own account, de Chancourtois and Newlands were among
those “foremost” in research that led to the discovery of
this law. 7
While not the first scientist to attempt a
comprehensive organization of the elements, Mendeleev
did publish a paper in 1869 with the first draft of the
modern periodic table. In this table, families of elements
were arranged horizontally; however, Mendeleev
eventually revised this format to the vertical structure
found in contemporary chemistry textbooks. 8 Based
on the patterns he observed, Mendeleev suggested that the
properties of elements are a reflection of their atomic weight.
Also based on these patterns, Mendeleev made concrete
predictions about elements that had yet to be discovered.
For instance, Mendeleev predicted the discovery of two
elements analogous to aluminium and silicon; these were
later discovered to be gallium and germanium. 9 This
predictive power became one of the defining characteristics
of the periodic table.
The periodic table proposed by Mendeleev was the
culmination of many observations and discoveries— 10
unfortunately, many of his peers were reluctant to accept
his ideas. From electronegativity to electron orbitals, the
periodic table 11 anticipating many future topics of
scientific inquiry. Even today, scientists use the predictive
power of the periodic table to generate new hypotheses and
design experiments that further expand our understanding
of the universe.