elements
what is group one period one on the PTE
Hydrogen
what is the more modern way of saying "atomic weight".
atomic number
what is found in each elements box
what was the last element discovered
Ununennium
why was the pte made
to organize the elements
true or false: Metals take up more then three quarters of all known elements
True
how many valence electrons does oxygen have?
6 valence electrons
when was the PTE made?
1869
what is the only letter not on the PTE
J
what are the basic building blocks for all matter
elements
who created the PTE
Dmitri Mendeleev
what elements take up over 99% of the world
Hydrogen and helium
what was the first man made element
Technetium
when was hydrogen discovered?
1766
what is the rarest element
Astatine