Question

periodic table basics practice choose all that apply to europium
transition metal
group 10
7 electron energy level
period 6
member of the actinide series
member of the lanthanide series
same period as astatine
same group as palladium
stable metal
unstable

Explanation:

• Europium (Eu) is a lanthanide (not actinide), in period 6, has 6 electron energy levels (not 7), not transition metal/group 10/same group as palladium/same period as astatine (astatine is period 7). Eu is unstable (radioactive, though some isotopes have short - lived stability, but generally considered unstable in context of such questions), not a stable metal. And it is a member of the lanthanide series, in period 6, and unstable.

Answer:

• Member of the lanthanide series
• Period 6
• Unstable