How do I calculate the number of protons and neutrons for a fictitious element when only given the atomic weight?

Question

I have a list of fictitious elements to put into a periodic table (of my own design).  I have the atomic weight, physical state (gas, diatomic gas, hard brittle solid, ,hard w/high melting point, soft w/low melting point, liquid w/low boiling point, diatomic volatile liquid, diatomic volatile solid, soft low melting solid), the electrical conductivity (high, very high, low, very low, & semiconductor), and reactivity (very high, high, medium, medium low, very low).

I am having a difficult time choosing how to organize into periods and groups.

Answer 1

Hi,

 

I will help you as much as I can. I can tell you that you're being asked to use periodic trends to sort this mess out. First, lets sort the list into different groups based on the properties that you stated. Now we have the group major groups. Next if you look at the actual periodic table you will see that atomic weight increase going to the right and down. That is as much as I can help you with from here. This is a good resource:

 

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Periodic_trends.svg/1280px-Periodic_trends.svg.png

 

I hope this helps!