নীলনদ আর পিরামিডের দেশ কাহিনী অনুযায়ী সুদানবাসীর শারীরিক গঠন বর্ননা?
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Modern periodic law : The physical and chemical properties of elements are the periodic functions of their atomic number (or) electron configuration. i) The modern periodic table has eighteen vertical columns known as groups and seven horizontal rows known as periods. ... These are also called as Transition elements.
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