Chemistry

4. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
7. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
8. a material or object that permits an electric current to flow easily
9. atoms as a source of nuclear energy.
10. the appearance of a mineral surface in terms of its light-reflective qualities

1. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
2. a thing that is composed of two or more separate elements; a mixture.
3. the property of a material that fractures when subjected to stress but has a little tendency to deform before rupture
5. level he fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
6. the ability of a material to be drawn or plastically deformed without fracture.