How can elements with low atomic numbers have so many spectral lines? 1. Elements with low atomic numbers usu- ally don't react chemically with other ele- ments. 2. Elements with low atomic numbers have many free electrons. 3. Elements with low atomic numbers have small masses. 4. Electrons can be boosted to many energy levels, thus making many different transitions to ground level and levels between.

How can elements with low atomic numbers have so many spectral lines? 1. Elements with low atomic numbers usu- ally don't react chemically with other ele- ments. 2. Elements with low atomic numbers have many free electrons. 3. Elements with low atomic numbers have small masses. 4. Electrons can be boosted to many energy levels, thus making many different transitions to ground level and levels between.