- period (periodic table)
- period element
- period of element
- 元素: element; elementary substanc ...
- 周期: period; cycle; circle; revol ...
- 元素周期表: periodic chart; periodic system; periodic table of ele ments; periodic table of elements
- 元素周期律: periodic law of elements
- 元素周期系: periodic system of elements
关注微信公众号:chachacidian,回复:元素周期,即可在微信中查询翻译