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The modern periodic table sorts by atomic number from left to right in rows, known as periods. Elements are grouped in to columns by consistent properties, as first noted by Dmitri Mendeleev. Mendeleev noticed that elements followed predictable trends when ordered by mass, and grouped them based on this simple observation. This observation is now recognized as the Periodic Law--all elements, discovered or undiscovered, will follow various predictable trends. It is important to note that Mendeleev left gaps in his first table for elements he expected based on properties, but had not been discovered.

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  • Periodicity
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  • The modern periodic table sorts by atomic number from left to right in rows, known as periods. Elements are grouped in to columns by consistent properties, as first noted by Dmitri Mendeleev. Mendeleev noticed that elements followed predictable trends when ordered by mass, and grouped them based on this simple observation. This observation is now recognized as the Periodic Law--all elements, discovered or undiscovered, will follow various predictable trends. It is important to note that Mendeleev left gaps in his first table for elements he expected based on properties, but had not been discovered.
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  • The modern periodic table sorts by atomic number from left to right in rows, known as periods. Elements are grouped in to columns by consistent properties, as first noted by Dmitri Mendeleev. Mendeleev noticed that elements followed predictable trends when ordered by mass, and grouped them based on this simple observation. This observation is now recognized as the Periodic Law--all elements, discovered or undiscovered, will follow various predictable trends. It is important to note that Mendeleev left gaps in his first table for elements he expected based on properties, but had not been discovered.
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