Astatine, an extremely rare halogen which no-one really have experienced. It is so rare, that if you dug up the whole crust of the earth, you would find what corresponds to an amount equal of your thumb.
It is also highly radioactive, which makes it abit uninteresting chemically.
N stands for Nitrogen on the periodic table.
Beryilium
iodine
there is no such element
iodine
No, the symbol "H" stands for Hydrogen on the periodic table. The symbol "He" stands for Helium on the periodic table.
Sn stands for the element tin in the periodic table.
Argon is what Ar stands for on the Periodic Table of elements.
Sr stands for strontium on the periodic table of elements.
11 is the atomic number for the element sodium in the periodic table.
potassium
Beryllium (Be)