This was a more direct and potentially more rapid means of creating change than the traditional approach of mounting court challenges.In 1952, the Regional Council of Negro Leadership (RCNL), led by T.. 
Iye àwọn nùkle (prontons ati neutrons) ninu Nurau ní nọmba àkójọ, and each ìsọtope of a given element has a different mass number.For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 Ẹ̀bictivelyly 