Atomic and Ionic Radii Trends

As you move left to right on the periodic table, why does the atomic radius decrease?

• As more PROTONS are added, the more tightly the surrounding electrons are drawn inwards.

• As more NEUTRONS are added, the more tightly the surrounding electrons are drawn inwards.

• As the MASS of the nucleus rises, the more tightly the surrounding electrons are drawn inwards.

• As more ELECTRONS are added, the more tightly they draw themselves towards the nucleus.

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Which of these elements has the largest atomic radius?

• Aluminum (Al)

• Sodium (Na)

• Argon (Ar)

• Magnesium (Mg)

Answer explanation

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Which of these elements has the largest atomic radius?

• Silicon (Si)

• Bromine (Br)

• Barium (Ba)

• Magnesium (Mg)

Answer explanation

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As you move from top to bottom on the periodic table, what happens to the atomic radius?

• It increases.

• It decreases.

• It remains the same.

• It increases, then decreases.

Answer explanation

Which of these elements has the smallest atomic radius?

• Phosphorus (p)

• Nitrogen (N)

• Bismuth (Bi)

• Antimony (Sb)

Answer explanation

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