Question

what element has the following electron configuration? 1s²2s²2p⁶3s²3p⁶4s²3d⁶
cobalt
manganese
iron
chromium

Explanation:

To determine the element from the electron - configuration, count the total number of electrons. The sum of the electrons in each sub - shell gives the atomic number. For \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}\), \(2 + 2+6 + 2+6 + 2+6=26\). The element with atomic number 26 is iron.

Answer:

C. iron