0 Elements of s-block , Properties of the first group elements 1A ( Alkali metals ) in the periodic table February 13, 2018 by Heba Soffar · Published February 13, 2018 · Last modified March 13, 2018
0 The critical angle and the total internal reflection May 20, 2015 by Heba Soffar · Published May 20, 2015 · Last modified September 3, 2016
0 Transition elements & Economic importance of elements of the first transition series October 10, 2018 by Heba Soffar · Published October 10, 2018 · Last modified October 12, 2018
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