Last Updated
：2025/11/19
protactinium
IPA(Pronunciation)
Quizzes for review
A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.
音声機能が動作しない場合はこちらをご確認ください
See correct answer
protactinium
The sample of protactinium weighed only a few milligrams, making it difficult for researchers to study its properties.
See correct answer
The sample of protactinium weighed only a few milligrams, making it difficult for researchers to study its properties.
音声機能が動作しない場合はこちらをご確認ください
English - English
Word Edit Setting
- Users who have edit permission for words - All Users
- Screen new word creation
- Screen word edits
- Screen word deletion
- Screen the creation of new headword that may be duplicates
- Screen changing entry name
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
Sentence Edit Setting
- Users who have edit permission for sentences - All Users
- Screen sentence deletion
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
Quiz Edit Setting
- Users who have edit permission for quizzes - All Users
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
