Which is bigger?
Fr or F?
Fr
has the most radioactive elements?
Inner transition metals
How many elements in 1700s?
33
He or H?
He
B or C
C
K or Zn?
K
Which group forms +2 ions?
alkali earth metals
How are elements organized on the modern periodic table?
by atomic number
I or Cl?
Cl
O or S?
O
Os or Fe?
Os
Which group is the most reactive metals?
akali metals
Who came up with the modern periodic table?
Mosley
Cs or He?
He
Kr
Xe or He?
Xe
Which group is all gases?
Nobel Gases
Why was Mendeleev's table so much better than others of his time?
He could predict the properties of unknown elements
Ga or Ge?
Ge
F or O?
F
Cu or Fe?
Fe
Which group has the most essential elements for life?
Non metals
How did Mendeleev organize his periodic table?
by atomic mass
Na or K
Na
F or Ne?
F