Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold

It is Promethium

Explanation:

Because they are chemical elements with atomic numbers 57 through 71

The answer is B) Promethium

Explanation:

The Promethium is a chemical element of the periodic table whose symbol is Pm and its atomic number is 61 and is part of the group of lanthanide elements.

Lanthanides are a group of elements that are part of period 6 of the periodic table of the elements whose name comes from the chemical element lanthanum, which is included within this group, giving a total of 15 elements, from the element of atomic number 57 (lanthanum) to 71 (lutetium)

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

personal, she chose to do it.