To determine which element would have properties most similar to lithium, we need to focus on the number of protons, as the number of protons defines the element. Lithium has 3 protons, so we should look for an element that has a similar atomic structure.
Now, let's analyze the choices:
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An element with 11 protons, 11 neutrons, and 11 electrons - This corresponds to sodium (Na), which is in the same group (alkali metals) as lithium (Li) and has similar chemical properties.
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An element with 4 protons, 4 neutrons, and 3 electrons - This would correspond to beryllium (Be), which is in Group 2 and has different properties compared to lithium.
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An element with 12 protons, 12 neutrons, and 12 electrons - This is magnesium (Mg), which is also in the same period as sodium but different from lithium regarding chemical properties.
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An element with 10 protons, 12 neutrons, and 10 electrons - This would correspond to neon (Ne), a noble gas, which has very different properties compared to lithium.
Therefore, the element with 11 protons, 11 neutrons, and 11 electrons (sodium) would have properties most similar to lithium due to being in the same group of the periodic table.