What element is 1s22s22p63s23p64s23d104p65s1

Rubidium

Explanation:

Add the exponents: 2+2+6+2+6+2+10+6+1=37

Look for the atomic number 37

2+2+6+2+6+2+10+6+1=37

which is the atomic number of rubidium(Rb)

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