Atoms of which two elements could combine with atoms of chromium (Cr) to form ionic bonds?
O A. F.
B. Au
C. Se
D. Ti
E. Mg

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

How do you know how many valence electrons an atom has?