البحث
إكتشاف أشخاص جدد وإنشاء اتصالات جديدة وصداقات جديدة
the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur
the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur
the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur
the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur
the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur