Final answer:
The complete electron configuration for beryllium (Be) is 1s²2s² and for carbon (C) is 1s²2s²2p². The configuration 1s²2s² matches beryllium (Be), and 1s²2s²2p⁶ matches neon (Ne).
Step-by-step explanation:
The subject of this question is the electron configurations of elements, specifically beryllium (Be) and carbon (C), which is a basic concept in chemistry courses. We need to write the complete electron configurations for both elements.
For beryllium (Be), with an atomic number of 4, its electron configuration is 1s²2s². Beryllium has a total of four electrons: two electrons fill the 1s subshell, and the remaining two electrons fill the 2s subshell.
Moving to the next element carbon (C), with an atomic number of 6, we need to continue filling the subshells in order. The first two electrons fill the 1s subshell, the next two electrons fill the 2s subshell, and the remaining two electrons begin to fill the 2p subshell. Therefore, the electron configuration for carbon is 1s²2s²2p².
To identify elements by their electron configurations:
- The configuration 1s²2s² corresponds to beryllium (Be).
- The configuration 1s²2s²2p⁶ corresponds to neon (Ne), as it has a total of 10 electrons.