Period 2
Period 2
Eight elements from lithium to neon: the fundamental building blocks of organic chemistry.
Element count
8
First element
Z = 3
Last element
Z = 10
Period 2 fills the 2s and 2p subshells. It contains carbon, nitrogen and oxygen — the pillars of the chemistry of life — along with light elements whose properties sometimes deviate from the rest of their group (the so-called second-period anomaly).
Filling subshells
2s2p