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Different atoms require different amounts of energy to get excited
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The answer to where the energy went is that it is stored in the excited atom. You've already learned about atomic orbitals so you know that atoms have a "ground state" and at least one "excited state." It takes energy to move an atom from the ground state to an excited state. That energy is stored when one of the atom's electrons (it's usually only one) changes from one orbital to another.
In the experiments you've been doing, the energy to excite the stationary atom was provided by converting the kinetic energy of the moving atom -- if there wasn't enough kinetic energy the atom wouldn't excite. That's why you couldn't excite the atom at low speeds.
The minimum speed at which a moving atom can excite a stationary one is called the threshold for excitation. Different atoms have different thresholds for excitation. Below are two new kinds of atoms. Find the threshold for excitation for each kind of atom and answer the questions below.
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<b><font size="5" face="Trebuchet MS">Different atoms require different amounts of energy to get excited</font></b>
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<body face=Verdana><font size=4>What is the threshold for excitation of the brown atom?
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<body face=Verdana><font size=4>What is the threshold for excitation of the yellow atom?
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1600 m/s
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