Which set of elements has the most similar physical and chemical properties? H
Li/Be
Na/Mg
K/ Ca
Rb/Sr
Cs/Ba
Fr/Ra

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

the answer is c.the valence of the atoms combine .

the answer your looking for is c).