放射 ほうしゃ せい系列 けいれつではありませんでした
hōshaseikeiretsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 放射性系列

1. Was not a radioactive series.; Was not part of a radioactive series.

Past/Perfective
Negative
Polite
Formal Register
Physics