periodic table and seperating mixtures Flashcards
1
Q
Mendeleev
A
Started 1867- changed atomic weights
left gaps
when started drawing periodic table noble gases not discovered so argon did not fit in and created a group 0.
1869- Published periodic table
Elements in a group had the same chemical properties
2
Q
Newlands
A
Discovered law of octaves meaning every 8th element had same properties when arranged in atomic weight
Did not leave gaps for undiscovered elements.
3
Q
How does lithium react with water
A
Gives hydrogen gas Buzzing/buzzes Floats Moves slowly over the surface Slowly disappears
