(~s)
Isotopes are atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties. (TECHNICAL)
...tritium, a radioactive ~ of hydrogen.
N-COUNT
(~s)
Isotopes are atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties. (TECHNICAL)
...tritium, a radioactive ~ of hydrogen.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012