Final answer:
The element with the electron configuration 1s2, 2s2, 2p1 is Boron (B), which comes after beryllium and before carbon in the periodic table.
Step-by-step explanation:
The element that corresponds to the electron configuration 1s2, 2s2, 2p1 is Boron (B). In this configuration, the first two electrons fill the 1s orbital, the next two fill the 2s orbital and one electron enters the 2p orbital. For the elements in the 2nd row of the periodic table, starting with lithium (1s22s1), each element gains an additional electron in their respective orbitals in a sequential manner up to neon (1s2 2s2 2p6). Boron, with its five electrons, comes right after beryllium and before carbon, following the order of increasing atomic number and electrons. Therefore, the correct answer is A) Boron.