question_answer 60)

    Identify and name the metals out of the following elements whose electronic configurations are given below. (a)2, 8, 2                               (b)2,8,1                (c) 2, 8, 7                              (d)2,1

Answer:

                  The following elements whose electronic configurations are given below

Electronic configuration	Number of valence electrons	Matal/ Non - Metal	Atomic Number	Name of the Element
(a)   2, 8, 2	2	Metal	2+8+2=12	Magnesium
(b)   2, 8, 1	1	Metal	2+8+1=11	Sodium
(c)   2, 8 ,7	7	Non- Metal	2+8+7=17	Chlorine
(d)   2,1	1	Metal	2+1=3	Lithium

  Thus, elements (a), (b) and (d) are metals while (c) is a non-metal.