原子序数 Traditional 原子序數 yuán zǐ xù shù 🔊 atomic number + Keep this word Meanings yuán zǐ xù shù 原子序數 atomic number Its characters 原yuánformerHSK 5子zǐsonHSK 3序xùorder; sequenceHSK 7–9数shǔto countHSK 4