Which lanthanide has the least mass?

Understand the Problem

The question is asking to identify which lanthanide element has the least atomic mass. This involves knowing the properties of lanthanides and comparing their atomic weights.

More Information

Lanthanum is the lanthanide with the lowest atomic number (57) and therefore the least mass. It is commonly used in industry and various technologies.

Tips

Do not confuse the smallest atomic radius or size with the least mass; they are different properties.

Sources

• Lanthanide Series | Encyclopedia.com - encyclopedia.com