Question

the atom of an element has 2 electrons in the m-shell.what will be atomic number of the element ?name the element?state it's electronic configuration​

Answer 1

total no. of electrons in k shell = 2

total no. of electrons in l shell=8 no. of electrons in m shell = 2

so, total no. of electrons = atomic no. of that element

thus atomic no. of that element is 2+8+2 = 12

hence the name of that element is magnesium and it's electronic configuration is (k)2,(l)8,(m)2