Is it true that lithium and sodium have low densities?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
The density of atoms is inversely proportional to their volumes and directly proportional to their masses. The atomic weight of lithium is lower than that of sodium. As a result, lithium has a lower density than sodium. In the case of sodium and potassium, the increase in shell size outweighs the core's pull on the outer shell electron, resulting in potassium being less dense than sodium.

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