Nominally Atomic Mass, but in practice he knew this wasn't strictly correct and "cheated" a little based on chemical properties in a couple of cases (he thought the measured masses were wrong).
Mendeleev listed the atomic weights and chemical properties of elements as he began to organize them. He noticed that elements with similar properties appeared at regular intervals when arranged by increasing atomic weight.
Because the table is designed so that elements in the same column tend to have similar properties. The gaps at the top of the table are there to make the elements in vertical columns all have the same amount of outer-shell electrons.
It was Lavoisier who wrote the first extensive list of elements - containing 33 elements. He distinguished between metals and non-metals, dividing the few elements known in the 1700's into four classes.
Mendeleev organized the elements in his table by increasing atomic mass and grouping elements with similar properties together. He left gaps in his table for unknown elements and accurately predicted the properties of these missing elements based on the patterns he observed.
Basic information about and classifications of gallium are on the periodic table.
Yes.
Dmitri Mendeleev is credited with developing the periodic table of elements in 1869. He arranged the elements by increasing atomic mass, grouping together elements with similar properties. Mendeleev's table formed the basis for the modern periodic table.
Dmitri Mendeleev was the first scientist to create the periodic table
Mendeleev listed the atomic weights and chemical properties of elements as he began to organize them. He noticed that elements with similar properties appeared at regular intervals when arranged by increasing atomic weight.
He "Dmitri" propose that the periodic table of elements that the elements should be grouped by rows and column and by atomic mass,
Because the table is designed so that elements in the same column tend to have similar properties. The gaps at the top of the table are there to make the elements in vertical columns all have the same amount of outer-shell electrons.
It was Lavoisier who wrote the first extensive list of elements - containing 33 elements. He distinguished between metals and non-metals, dividing the few elements known in the 1700's into four classes.
Mendeleev organized the elements in his table by increasing atomic mass and grouping elements with similar properties together. He left gaps in his table for unknown elements and accurately predicted the properties of these missing elements based on the patterns he observed.
periodic table.
Water is a COMPOUND of two(2) elements, viz. Hydrogen(H) and Oxygen(O). These tqo elements are both found in the Periodic Table. The Periodic Table is a list of ELEMENTS, not compounds.
The "Periodic Table of the Elements". See related link below.
It contains a list of all known elements.