What subatomic particles contribute to the majority of the mass of an atom? Where are these particles located?

Does the energy in a solid increase or decrease when changing to a liquid?

What does x represent in the formula for the compound xcl4?

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone