Problem: Which of these statements is false?   A. Atomic radius increases on going down a group. B. Second ionization energies are always larger than first ionization energies. C. A cation is always smaller than its parent neutral atom. D. Valence electrons are more difficult to remove than core electrons. E. Xenon and iodide are isoelectronic.

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Which of these statements is false?

A. Atomic radius increases on going down a group.

B. Second ionization energies are always larger than first ionization energies.

C. A cation is always smaller than its parent neutral atom.

D. Valence electrons are more difficult to remove than core electrons.

E. Xenon and iodide are isoelectronic.

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