I need to know the measurements of this to the appropriate amount of significant figures

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Aliquid solution can be made select all that apply. dissolving solids into liquids, mixing liquids, dissolving gas solutes into liquids , mixing gases, mixing solids

An atom of element x has one more shell of electrons than an atom of beryllium, but it has one less valance electron than beryllium. which element is x