A message encoded by changing the voltage of an electric current is called .
a electronic current
b electronic signal
c electronic batter
d electronic watt

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory