It's do at 11 please help. 5. Be prepared to prove your understanding of atomic shells.

6. Understand the basics of isotopes and ions.

7. Know about the term "valence" and how it is used with regard to the atom.

8. Know the basics of acids and bases.

9. Understand the organization of the elements in the periodic table.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.

Which description best characterizes the motion of particles in a solid?