Argon

Where is Argon On The Periodic Table?

So I mentioned a periodic table earlier. The periodic table is a chart filled with all the elements that have been discovered. Argon is the 18th to have been discovered, landing it in the 18th group/column, and the 3rd period/row. The column it's in corresponds with it's amount of valence electrons, or the amount of electrons on the outer shell. I'll go into more detail about that in the next chapter. Although the groups determine the reactivity; the periods correspond with the amount of shells the atomic structure has. I'll explain that later as well. To locate Argon on the periodic table, look for the letters 'Ar'. Ar is the atomic symbol used for Argon. More examples of elements and their symbols would be, Ne for Neon, Kr for Krypton, Xe for Xenon, and Rn for Radium. Those elements can also be found in group 18. If you look at the card for Argon, you'll see that it has two numbers. 18 and and 40. 18 is the atomic number while 40 is the atomic mass.