









ordinal number
Early versions had the incorrect atomic number for some elements.
Then, there'd be an atomic number, for which there was no known element.

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Open the tool →序数 (xù shù) means “ordinal number”.
序数 is pronounced xù shù in Mandarin Chinese.
“ordinal number” is 序数 (xù shù) in Chinese.
This page has 2 example sentences using 序数, each with pinyin and an English translation.