Answer to Question #68161 in General Chemistry for Akeiya

Question

Which element has an electron configuration of: 1s^2 2s^2

Answer 1

The general number of electrons, according to given electron configuration, is 4 (2 electrons of first s-sublevel + 2 electrons of second s-sublevel). It means that atom has 4 electrons in its atomic structure, so number of protons is 4 too. We know that number of protons gives nuclear charge, and nuclear charge is a serial number of atom. Thus, number of atom at the Periodic table is 4. The element is Be (Beryllium).
Answer: Be (Beryllium).