Is a nylon string conductor or insulator

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which tool is least in predicting weather