Q: This question is about six elements, A to F. The letters are not the atomic symbols of the isotopes. Name each element from the information given.

(a) Element A has the nucleon number 12 and the electron configuration 2, 4.

(b) Element B has the proton number 15 and has 16 neutrons in the nucleus of the atom.

(c) Element C has the neutron number 10 and 10 electrons surrounding the nucleus of the atom.

(d) Element D has the proton number 14 and the neutron number 14.

(e) Element E has the nucleon number 40 and the proton number of 19.

(f) Element F has the proton number 4 and the nucleon number 9.

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

answer carbon and three oxygen atoms;