development of periodic table Flashcards
1
Q
how did mendeleev arrange elements in his periodic table?
A
in order of increasing atomic weight
2
Q
if he needed to, why would mendeleev switch order of specific elements?
A
so they fitted the patterns of other elements in the same group
3
Q
why did mendeleev leave gaps in his periodic table?
A
because he realised some elements hadn’t been discovered yet
4
Q
how are the way the modern period table arrangement of elements different to mendeleev’s table?
A
modern periodic table is arranged by atomic number, while mendeleev arranged by atomic weight
5
Q
what group hadn’t been fully discovered during the time of mendeleev?
A
group 0 noble gases
