* Lithium's Atomic Number: Lithium (Li) has an atomic number of 3, meaning it has 3 protons and 3 electrons.
* Electron Configuration: The electron configuration of lithium is 1s²2s¹. This means it has 2 electrons in its first energy level (1s) and 1 electron in its second energy level (2s).
* Nearest Noble Gas: The nearest noble gas to lithium is helium (He), which has an electron configuration of 1s².
* Noble Gas Configuration: To write the noble gas configuration of lithium, we use the symbol of the nearest noble gas in brackets followed by the remaining electrons: [He] 2s¹
Therefore, the noble gas configuration of lithium is [He] 2s¹.
