Which of the following accurately describes properties of valence?
a. the smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom.
b. nonmetallic elements tend to have a positive valence and tend to be electron borrowers.
c. metals tend to have a negative valence and tend to be electron borrowers.
d. the greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Which accurately compares concave and convex lenses?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?