the periodic table- Mendeleev

Question 1

who was the first periodic table made by

Answer 1

mendeleev

Question 2

how did Mendeleev make the periodic table

Answer 2

he took the elements that had been found at the time and placed them in order of the atomic mass

Question 3

how did mendeleev arrange the elements into groups

Answer 3

based on how they and their compounds behaved

Question 4

why were few elements in the wrong group

Answer 4

this was because the atomic mass was wrong due to isotopes

Question 5

if the elements did not fit the pattern what did mendeleev do

Answer 5

he switched the order of the elements to keep those with the same properties in the same column

Question 6

why did mendeleev have to keep gaps in the periodic table

Answer 6

to keep elements with similar properties together

these gaps also showed where elements that hadnt been discovered yet would go

Question 7

how did mendeleev predict the properties of the missing elements

Answer 7

by using the properties of other elements