In the preceding analysis, what assumption did you make about Q (energy flow from surroundings into the system due to a temperature difference)? Q was negligible because the process lasted only a short time. Q can be ignored because colliding objects never get hot. Q = ΔEthermal

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Zinc contains about 30 protons 

Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f.