Final answer:
The electron configuration 1s²2s²2p⁶6s²3p⁶4s²3d¹⁰ represents the element Calcium (Ca), which has a total of 20 electrons matching its atomic number in the configuration ending with 4s².
Step-by-step explanation:
The element represented by the electron configuration 1s²2s²2p⁶6s²3p⁶4s²3d¹⁰ is Calcium (Ca). We can determine this by adding up the number of electrons in the configuration: there are a total of 20 electrons, which corresponds to calcium's atomic number.
The electron configuration given ends with 4s², which is typical for the elements in the second column of the s block. According to the provided information, we see that Calcium's electron configuration should indeed end with s² and matches the full configuration given: [Ar]4s².
As an additional point, the other elements listed (carbon, oxygen, and silicon) have different numbers of electrons and different electron configurations. For example, carbon has an electron configuration 1s²2s²2p², which does not match the electron configuration provided in the question.