镧系:周期表中从镧到镏(原子序数57~71)15种按顺序排列的化学元素系列。
Lanthanide: Any of the series of 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57-71).
它们有相同的原子序数,因此化学行为几乎完全一样,但原子量不同。
They have the same atomic number and hence nearly identical chemical behaviour but different atomic masses.
非金属化学元素,化学符号P,原子序数15。
Phosphorus Nonmetallic chemical element, chemical symbol P, atomic number 15.
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