history of development of periodic table. Flashcards
who was the first person to try and put together the periodic table?
John Newlands.
1864.
how many elements had been discovered when John Newlands tried to put the period table together/
63.
how did John Newlands arrange the periodic table?
order of atomic weight.
who was the second person to try and put together the periodic table.
Dimitri Mendeleev.
1869.
what did Dimitri Mendeleev realise?
there were still elements to be discoverd.
what did Dimitri Mendeleev do when he created his table?
left gaps for undiscovered elements.
reordered some elements.
each element was placed in a vertical column called with what pattern?
group.
elements had similar properties.
what did Dimitri Mendeleev use his table to do?
predict the existence and properties of new elements.
when sub atomic particles were later discovered what did it reveal about how Dimitri Mendeleev’s organised the elements?
order of increasing atomic number ( number of protons.)
