In 1913, English physicist Henry Moseley correlated the properties of elements to their atomic numbers.
The later discovery of elements predicted by Mendeleev verified his predictions.īut there were several discrepancies in Mendeleev’s periodic table. He created a periodic table in which elements were arranged in increasing order of their atomic masses and he left gaps for elements that were yet to be discovered. In 1869, Russian chemist Dmitri Mendeleev came up with the periodic law which stated that properties of elements are periodic functions of their atomic masses. He left no gaps for undiscovered elements. Then, in 1864 John Newlands arranged the elements into a table in which every eight elements had similar properties. It was observed that some properties of the middle element, such as atomic weight, are the average value of the other two elements in each triad. He tried grouping the elements as metals and nonmetals.įorty years later, German physicist Wolfang Dobereiner arranged the elements in groups of three in increasing order of atomic weight and called them triads. Antoine Lavoisier was the first who determined similarity in properties of certain elements. Several scientists worked to assemble the elements into a proper format. Scientists use the table to analyze, predict and, understand properties of different elements and speculate on the properties of those yet to be discovered. The periodic table is a tabular organization of elements that shows the periodicity in the properties of elements. But in the 19th century, Henry Moseley introduced the concept of atomic number in the periodic table which was found to be the most accurate arrangement.Ĭhemists have always looked for ways of arranging the elements to reflect the similarities between their properties.
There were many attempts made by different scientists in history to arrange the elements in a proper manner. Hint: Periodic table is an arrangement of elements discovered to date in a tabular form that is used to analyze the properties of elements.