atomic number 57
ریشه و کاربرد
ریشه
From the Greek word 'lanthanein' meaning 'to lie hidden'.
مثال
- Lanthanum has an atomic number of 57.
- The atomic number 57 element is used in camera lenses.
- Atomic number 57 is associated with the chemical symbol La.
تعریف انگلیسی
noun
- a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth