氢原子 Traditional form: 氫原子 Pinyin (reading): qīngyuánzǐ Definitions: hydrogen atom Characters: 氢 - ammonia 原 - source, origin, beginning 子 - son, child; seed, egg; fruit; small thing Traditional characters: 氫 - ammonia 原 - source, origin, beginning 子 - son, child; seed, egg; fruit; small thing