Which element has : (i) two shells, both of which are completely filled with electrons ? (ii) the electronic configuration, 2, 8, 2. (iii) a total of three shells, with four electrons in its valence shell ? (iv) a total of two shells, with three electrons in its valence shell ? (v) Twice as many electrons in its second shell as in its first shell ?

Which element has : (i) two shells, both of which are completely fill

1.	Which element has : (i) two shells, both of which are completely filled with electrons ? (ii) the electronic configuration, 2, 8, 2. (iii) a total of three shells, with four electrons in its valence shell ? (iv) a total of two shells, with three electrons in its valence shell ? (v) Twice as many electrons in its second shell as in its first shell ?
Answer» Solution :(a) NE (B) MG ( c) Si (d) B (e) C