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Which is the bigger atom: aluminum or sodium?

Answer 1

Consider atomic numbers, #Z#, of each element.

#Na, Z=11#; #Al, Z=13#.

Because valence electrons in aluminum are known to shield one another very imperfectly, aluminum has a greater nuclear charge than other metals. This increased effective nuclear charge tends to decrease atomic radii across the Period from left to right.

You should present some numbers for discussion as a physical scientist. To start, consider this: the various ionization energies can be explained using a periodic basis.

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Answer 2

Luna Chen

The aluminum atom is larger than the sodium atom.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.