The atomic mass of an element a. the sum of the protons and electrons in one atom of the element b. twice the number of protons in one atom of the element c. a ratio based on the mass of carbon-12 atom d. a weighted average of the masses of an elements isotopes

The number of protons in the nucleus of an atom determines an element's atomic number.

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.