How does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors? a. They have one or two valence electrons, so they cannot lose electrons easily.

b. They have one or two valence electrons, so they can lose or gain electrons.

c. They have three to six valence electrons, so they cannot lose electrons easily.

d. They have three to six valence electrons, so they can lose or gain electrons

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.