(a) Explain what is the valence electron is and why the Lewis symbol for an atom only accounts for electrons in the valence shell of the atom.
(b) Sketch the Lewis Dot Structure for each of the following compounds and state the molecular geometry.
(c) What is the octet rule and how it is achieved?
2A. LEWIS SYMBOLOF K THE ATOMIC NUMBER OF K IS 19.AS THE ELECTRONIC CONFIGURATION OF K(POTASSIUM) IS 1s2 2s2 2p6 3s2 3p6 4s1 IT HAS ONE ELECTRON IN ITSOUTERMOST SHELL HENCE ITS NUMBEROF VALENCE SHELL ELECTRON IS 1 HENCE ITS ELECTRONIC CONFIGURATION IN HYBRID STATE IS 1s2 2s2 2p6 3s2 3p6AND K DONATES 1 ELECTRON. THEREFORE ITS LEWIS SYMBOL IS " K • " LEWIS SYMBOL OF As THE ATOMIC NUMBER OF As IS 33.ITS E.C IS 1S2 2S2 2P6 3S2 3P6 4S2 3D10 4P3.THE VALENCE ELECTRON OF AsIS 5 HENCE ITS LEWIS SYMBOL IS " :As.: " LEWIS SYMBOL OF Sn+2 THE ATOMIC NUMBER OF Sn IS 50. ITS E.C IS [Kr]4D10 5S2 5P2.NOW TWO ELECTRONS
C. The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. ... This primarily affects the element hydrogen, which forms stable compounds by achieving two valence electrons.