What periodic element has 4 energy levels, 7 valence electrons and not a conductor?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

+= + + balance the equation on coefficients, ex. 1,1,1