i have no idea but i will check and keep you posted.
i need help
When making his periodic table Mendeleev noticed some spaces where elements should be couldn't be filled. He didn't want to force elements that didn't belong there to go there, so he believed the spaces were undiscovered elements. He left the names blank but predicted their properties. Later the elements Mendeleev predicted existed were discovered.
Dmitri Ivanovich Mendeleyev. Another spelling of his name is Dmitri Ivanovich Mendeleev.
Patterns
He was bold enough to reverse the order of some pairs of elements and to predict that their atomic masses were incorrect. Some of these predictions were correct, but others were not, because we now know that the fundamental basis of the periodic table is atomic number rather than atomic mass.
The Mendeleev-style periodic table omits all of the elements from groups 3-12 (also known as the d-block elements) by including them in the main group.
mendeleev's name for a column of elements was groups.
It is true.
"Family of elements" is the synonym of group (column) in the periodic table of Mendeleev.
Mendeleev grouped lithium with potassium and sodium in his periodic table based on their similar chemical properties and valence electron configurations. He recognized that these elements belonged to the alkali metal group.
Group 7 of the periodic table of Mendeleev and period 7 (transfermium elements).
Oxygen is in the group 16 of the periodic table of Mendeleev - chalcogenides group.
Group 3, period 4 in the Mendeleev periodic table of the elements.
Group 2, period 2 in the Mendeleev table of elements.
Berkelium is in the period 7 of the Mendeleev table of chemical elements and in the group of actinides.
This is the group 18 of the periodic table of Mendeleev.
The Halogens. Other elements in this group are Fluorine, Chlorine, Bromine and Astatine.