What is the electron configuration of an atom with the atomic number 3, and how does it relate to its position on the periodic table?

The electron configuration of an atom with the atomic number 3 (lithium) is 1s2 2s1. This means it has 3 electrons, with 2 in the first energy level and 1 in the second energy level. The position of lithium on the Periodic Table is in the second period and the first group (or column), which indicates its outermost electron is in the s orbital.