Read the list of elements given below. f, cl, br, i which of the following about the elements is true? all of them are highly reactive metals. all of them are highly reactive nonmetals. f and cl are reactive nonmetals and br and i are highly reactive metals. f and cl are reactive metals and br and i are highly reactive nonmetals.

All of them are highly reactive nonmetals.

Answerhund's rule;

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.