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Extended periodic table

refers to the extension on the periodic table beyond its current 7 periods including additional periods

Pronunciation
/ɛkˈstɛndɪd ˌpɪərɪˈɒdɪk ˈteɪbəl/
/ˌɪkˈstɛndəd ˌpɪriˈɑdɪk ˈteɪbəl/