Last Updated
：2025/11/20
Quizzes for review
(physics, chemistry) The total number of protons and neutrons in an atomic nucleus. Symbol: A
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
mass number
The mass number A of an atom, equal to the total number of protons and neutrons, helps distinguish its isotopes.
See correct answer
The mass number A of an atom, equal to the total number of protons and neutrons, helps distinguish its isotopes.
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
