Which of the following classifications describes the element with the electron configuration [Ar]4s23d104p5? A) stable metal
B) unstable nonmetal
C) stable nonmetal
D) unstable metal

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

How many peaks will be present in a mass spectrum for brcl?

How does science use models to gain a better understanding of concepts?