Barium has the noble gas configuration [Xe]6s².
You can learn about noble gas configurations at
http://socratic.org/questions/how-can-i-write-a-noble-gas-shorthand
To work backwards and find the element with a given configuration, you first find the noble gas in .
Xe is element 54.
Your element has two more electrons (and two more protons) than Xe. It must be element 56. Look in the Periodic Table, and
Element 56 is barium, Ba.
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