Why is it impossible to have an undiscovered element that would fit between sodium and magnesuim

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. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: