[ Vocabulary ]
What are atoms of the same element that have different numbers of neutrons?
A. aluminium
B. radioactive dating
C. isotope
D. hydrogen
Select your answer:
Random Topics:
ComparisionNoun and PronounHomophonesTenses and Time MarkersPresent Perfect Tense or Present Perfect Continuous TenseTenses: Present simple, Past Simple, Future SimpleWish SentenceIf Conditional Zero and OneVocabulary Spelling GrammarGender and GrammarOther quiz:
Grammar › ViewThe mayor wants to ….. public awareness about the town’s rubbish problem.
A. gather
B. organize
C. reach
D. raise
Grammar › View
He wishes he ___ to play the guitar.
A. know
B. knows
C. knew
D. knowing