Dimitri Mendeleev created the modern Periodic Table in 1869, which was arranged by Atomic Mass.
In 1913, Henry Moseley published the results of his measurements of wavelengths of the X-ray spectral lines of a number of elements. This showed the ordering of the wavelengths of the X-ray emissions of the elements coincided with the ordering of the elements by atomic number, and not atomic mass. Also, further evidence has been shown with the large discovery and use of isotopes of the elements, the periodic law as Mendeleev, Meyers and others had proposed arranged by atomic mass, instead demonstrated that the properties of the elements varied according to their atomic number.
Dmitri Mendeleev arranged the elements into triads in the periodic table. Mendeleev noticed that elements with similar properties occurred at regular intervals when arranged by increasing atomic mass.
Henry Moseley arranged the elements in order of increasing atomic number rather than increasing atomic mass, which led to the modern periodic table.
Dmitri Mendeleev is credited with arranging the elements in the periodic table according to increasing weight. He also left gaps for undiscovered elements and predicted their properties, leading to the development of the modern periodic table.
The second scientist to organize the elements was Henry Moseley. He arranged them in order of increasing atomic number which led to the modern periodic table we use today.
basically? how they react.some scientist guy who was good with calculations predicted qualitys of elements like, ages ago, before they were discovered.he basically designed the periodic table.if you notice, its in groupsthe first column, alkali metals, get nasty with water or anything more acidicsodium + water = firesodium + pure sulfuric acid = boom-------------------------------------They are arranged in increasing number of protons, and with respect to the number of electrons in the outer electron shell.
Dmitri Mendeleev arranged the elements into triads in the periodic table. Mendeleev noticed that elements with similar properties occurred at regular intervals when arranged by increasing atomic mass.
Dmitri Mendeleev was a scientist. He arranged elements in order of increasing atomic masses.
Henry Moseley arranged the elements in order of increasing atomic number rather than increasing atomic mass, which led to the modern periodic table.
atomic numbers
Henry Moseley
The Modern Periodic Law states that there will be a periodic repetition of properties when the elements are arranged according to increasing atomic number.
Dmitri arranged the elements in order of increasing atomic masses. He arranged elements in rows and columns according to atomic masses.
Dmitri Mendeleev is credited with arranging the elements in the periodic table according to increasing weight. He also left gaps for undiscovered elements and predicted their properties, leading to the development of the modern periodic table.
The second scientist to organize the elements was Henry Moseley. He arranged them in order of increasing atomic number which led to the modern periodic table we use today.
Dmitri Mendeleev and Lothar Meyer first arranged the elements in the increasing order of atomic masses. Bohr and Henry Moseley then arranged the elements in the increasing order of atomic number.
basically? how they react.some scientist guy who was good with calculations predicted qualitys of elements like, ages ago, before they were discovered.he basically designed the periodic table.if you notice, its in groupsthe first column, alkali metals, get nasty with water or anything more acidicsodium + water = firesodium + pure sulfuric acid = boom-------------------------------------They are arranged in increasing number of protons, and with respect to the number of electrons in the outer electron shell.
Mendeleev arranged the elements in his periodic table in order of increasing atomic mass while also grouping elements with similar properties together. His periodic table laid the foundation for the modern periodic table we use today.