History of the periodic table

Question 1

in what year did dalton discover about periodic table

Answer 1

in 1808, he was the first to arrange the elements in some sort of order and arranged elements in order of atomic weight

Question 2

in what year did newland discover things about the periodic table and what did he discover

Answer 2

in 1864 , He assumed all elements had been found. His table
only worked for known elements.“Arranged
elements in order of mass . He noticed that properties of every 8th element seemed similar .“Law of Octaves”

Question 3

in what year did mendeelv discover things abouthe periodic table and what did he discover

Answer 3

Left gaps for elements that had not been discovered. Newly
discovered element’s properties matched hispredictions.
Kept similar properties together rearranging if necessary

Question 4

who discoverd the periodic table first

Answer 4

dalton

Question 5

who discoverd the periodic table second

Answer 5

newland

Question 6

who discoverd the periodic table third

Answer 6

mendeelv

Question 7

how many elements known at the time did mendeleev find

Answer 7

50 elements or so

Question 8

how did mendeleev sort the elements

Answer 8

into groups based in the properties and the properties of their compound

Question 9

what did he then realise about hiw he should order

Answer 9

he realised he should put the lements in order of atomic mass, a pattern appeared and he could put the elements based on similar properties in column