What does "atomic number 45" mean?

a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum

What is a synonym for "atomic number 45"?

Common synonyms include: rh, rhodium.

Rare ·Advanced level

Noun

1
a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum wordnet