An atom has the following electron configuration: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^3 how many valence electrons does this atom have? a) 2, b) 3, c) 5, or d) 11

another question : the electron configuration of an element is 1s^2 2s^2 2p^4. describe what most likely happens when two atoms of this element move towards each other

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole