Answer :
Answer:
Cobalt (Co)
Explanation:
3d^7 is the location of Cobalt's last electron.
The element Cobalt has the electron configuration of
1s22s22p63s23p63d74s2.
Cobalt is an element which has an atomic number of 27 .It is a silver-grey
metal which is found in the earth crust.
The number of proton and electron is the same as the atomic number in a
neutral atom. In the example above, the total number of electrons in the shell
is 27 which is why Cobalt is the answer.
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