Lanthanum, element 57 ntawm lub sijhawm teem sijhawm. Txhawm rau ua kom lub sij hawm lub sij hawm ntawm cov ntsiab lus zoo sib haum xeeb, tib neeg tau tawm 15 yam ntawm cov ntsiab lus, suav nrog lanthanum, uas nws tus lej Atomic nce ntxiv, thiab muab lawv cais hauv qab lub sijhawm. Lawv cov khoom chemical yog si...
Nyeem ntxiv