An electron in a helium atom transitions from a 2p orbital to a ls orbital. The difference in energy between the two states is 3.40 x 10-18 J.
Which of the following best describes how the energy of the helium atom is affected by the electronic
transition?

Variables,control,conclusion and finally scientific theory

The answers is a nuclear changes

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. 

Pretty sure it's d. heterogeneous is separated by physical properties.