Posted inChemistry-9 Class 9 9th class Chemistry unit 1.9, Atomic number and mass number اٹامک نمبر اور ماس نمبر Posted by admin January 8, 2020No Comments admin View All Posts Post navigation Previous Post 9th class Chemistry unit 1.8, Fundamentals of chemistry MCQNext Post9th class Chemistry unit 1.10, Relative Atomic Mass and atomic Mass
