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electronic structure ruler
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It was by the end of the year 1991 after Chemistry class was over and during the period of History class that the concept ESR came to my attention by observing the diagonal diagrams which are used to calculate electronic configurations of the chemical elements. That was the moment where it all started.



Willing and with the opportunity to develop a faster and easier method to calculate electronic configurations that the ESR concept was originated. With the idea of adding the total of electrons for each diagram’s diagonal with the purpose of quickly finding in which diagonal was the chemical element we wanted to know its electronic configuration.

Once the total quantity of electrons per diagonal was determined, the first idea of the ESR concept took place by adopting the idea of an horizontal and continuous distribution of the orbital diagram making it possible to group them according to the corresponding amount from the sum of electrons by diagonal.




Due to the fact that the first concept mentioned above did not meet the objective of speeding the process of calculating electronic configurations that I modified the model in such way that it would offer the quantity of electrons corresponding to each orbital for a better chemical element position within the model through its atomic number.

I included in this particular model and, in an ambiguous manner the groups from where the chemical elements belong to.




After sharing my work with my Junior High and High School teachers

Having in mind the comments and suggestions of my Junior High and High School teachers with whom I shared my work that I started to make a new design of the ESR with the sole purpose of offering the information in a more detailed and understandable manner for the user.

The ESR model was then modified and quantum numbers that corresponded to each chemical element were added, such information caused great criticism and a lot of headaches.



On January 1997, after a long period of inactivity without designing or promoting the ESR, I decided to work on it again due to the need of developing and proposing it to my Entrepreneur Development Class Basically the work done in such program was to develop a business plan and of course to work on the ESR design computer wise.



To participate in the Entrepreneur Development Program turned out to be an interesting and useful experience since professors compelled us to apply surveys, prototypes, competitive advantages and disadvantages analysis, do a market study, make a marketing research plan, etc.

My teammates participating in this program were Ing. Juan Carlos Fontes and Lic. Alfredo Postlethwaite. We were the best project in class, however we did not qualified for the final Entrepreneurial Business Contest at ITESM, Campus Monterrey on May 1997.

At the end of the school semester at the University in June 1997 I continued the ESR project again but this time in a more formal and official manner. I was determined to launch it into market as a new chemical model for didactic purposes. I confess, I would like to mention that at this point I made a mistake by impelling this project into market instead of aiming towards what it was really meant for which is for the field and knowledge of humankind. (I believe that any scientist would agree with me).

During the summer and the second school semester in 1997, the ESR project was well on its way thanks to the sponsorship of some businessmen from the State of Baja California, Mexico.

During the project’s advancement hundred of surveys were applied. There was valued participation of Professors from the Chemestry faculty at ITESM, members from Colegio de Quimicos Farmaceuticos Biologos de Mexicali, B.C. and from Direccion de Ciencias Naturales de la SEP in coordination with the Chemestry Faculty at UNAM for analysis and evaluation of the utility and application of the ESR as a didactic tool. Grateful for their participation a variety of changes and adjustments were recommended in favor of the project.

Due to reasons that were against my will I had to leave studies behind for a short period of time. During this time having in mind all the recommendations made to me regarding my project I went ahead and started making those changes in order to improve it.

This time the ESR design was greatly improved after a long and extensive process of research and modifications. Finally, I was able to define a structure in which the design offered the calculation of the electronic configuration of each element as well as the information of each one of them.

In this model it was specifically included the precise information of atomic weigh , oxidation numbers and energy levels.



At the end of 1998, I sent an ESR sample along with some documents to the offices of a North American company to see if there was a possibility to launch the project into market. Unfortunately the response was negative.

In spite of my disappointment, now I recognize that the model at that time was not as versatile as it is now. Now I know why the project was rejected.

Months after receiving response to my proposal, on June 1999 along with a friend Ing. Rafael Flores Perez, started a website design in order to promote and offer teachers and students of all school levels the opportunity to find out about the Electronic Structure I received Ruler which was inaugurated in Internet September 3, 1999.

On September 8, days after its inauguration, professor Silvia Ponce’s Chemistry Students were invited to join answering a survey to evaluate the website as well as the ESR and of course to send their comments and suggestions.

Their response and participation was amazing offering us the opportunity to engage in a great deal of activities to enhance and improve the ESR design as well as the website.

After weeks of hard work, by the end of the month of October we launched the new website image through which the ESR design was presented for its promotion offering a new periodic table where all the chemical elements were found in alphabetical order for an easy access.

This new ESR model includes for the first time the following information: First ionization energy, electro negativity, atomic radius, fusion point, boiling point and elements classified by group.

At the same time, it is worth mentioning that with the objective of serving not only Spanish speaking people, the ESR was translated into English.



Due to the fact that I was invited to participate at the ITESM’s XXXI Congress of Research and Extension, after a year and a half of inactivity I decided to go back to the University. From January 19, 2001 to June 5, 2005 I gave the ESR project a brief rest in order to focus on my studies.

Weeks later after my graduation I went back again to my ESR project.

In January 2004, the ESR project was finally finished. More relevant information was included to each chemical element, besides adding a new perspective by giving it color, to make it enjoyable to the eyesight.



In this particular model more information has been added, to say: ionic radius, covalent radius electronic affinity, thermal conductivity, density, specific heat capacity, molar volume, atomization enthalpy, vaporization enthalpy, fusion enthalpy, and nomenclature table of chemical elements in Spanish and English.

From February 2004 to March 2005 I promoted the ESR to a North American company and to members of a Mexican publishing group with the hope of promoting and selling the ESR to Latin American and North American audience. Unfortunately, it was not what I expected. Even though it is a good tool, no one was familiar with it and the companies did not want to absorb the costs of an advertising campaign.

One fact leads to another. Today hoping that the ESR is acknowledged and useful to everyone who trusts and needs it. I finished my piece of work, you could say my masterpiece, by leaving it at hands reach, free to those who wish to acquire a copy of my model.


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