Answer:
4 elements for C7H5(NO2)3
Explanation:
Copper has an atomic number of 29, so it contains 29 protons and 29 electrons. ... The atomic weight of copper is 64; it has 29 protons and 35 neutrons.
They will fall at different rates because of air resistance
Answer:
mass
Explanation:
The amount of kinetic energy an object has, depends on its mass and its speed.