valency

noun
1
a measurement of the power of an atom to combine with others, by the number of atoms of hydrogen it can combine with or displace
ظرفیت, والانس, ظرفیت پیوندی, ظرفیت شیمیایی, ظرفیت ترکیبی, عدد ظرفیت
2
the number of grammatical elements that a word, especially a verb, combines with in a sentence
ظرفیت فعل, تعداد الزام‌ها