What is the heaviest lanthanide?

Answer 1

The smallest atomic number and atomic weight for a lanthanide is lanthanum itself, element 57.

The smallest atomic size is lutecium element 71; the lanthanides steadily decrease in atomic radius through the series, and the smallest is the last of them.

Answer 2

Lutetium is the heaviest, rarest, and most expensive lanthanide element.

Answer 3

The heaviest lanthanide element is lutetium (Lu), which has an atomic number of 71. It is the last element in the lanthanide series and is the most stable and densest of all the lanthanides.

Answer 4

LU