Hence, it is the atomic number alone that determines the chemical properties of an element; and it is for this reason that an element can be defined as consisting of any mixture of atoms with a given atomic number.
hˈɛns, ɪɾ ɪz ðɪ ɐtˈɑːmɪk nˈʌmbɚɹ ɐlˈoʊn ðæt dɪtˈɜːmɪnz ðə kˈɛmɪkəl pɹˈɑːpɚɾiz əvən ˈɛlɪmənt; ænd ɪɾ ɪz fɔːɹ ðɪs ɹˈiːzən ðæt ɐn ˈɛlɪmənt kæn biː dᵻfˈaɪnd æz kənsˈɪstɪŋ ʌv ˌɛni mˈɪkstʃɚɹ ʌv ˈæɾəmz wɪð ɐ ɡˈɪvən ɐtˈɑːmɪk nˈʌmbɚ.