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Arrange each of the following sets of atoms and ions, in order of increasing size: (a) Se^2-, Te^2-, Se; (b) Co³⁺, Fe²⁺, Fe³⁺; (c) Ca, Ti⁴⁺, Sc³⁺; (d) Be²⁺, Na⁺, Ne.

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Arrange each of the following sets of atoms and ions, in order of increasing size: (a) Se^2-, Te^2-, Se; (b) Co³⁺, Fe²⁺, Fe³⁺; (c) Ca, Ti⁴⁺, Sc³⁺; (d) Be²⁺, Na⁺, Ne.

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Arrange each of the following sets of atoms and ions, in order of increasing size: (a) Se2-, Te2-, Se; (b) Co3+, Fe2+, Fe3+; (c) Ca, Ti4+, Sc3+; (d) Be2+, Na+, Ne.

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Arrange each of the following sets of atoms and ions, in order of increasing size: (a) Se^2-, Te^2-, Se; (b) Co³⁺, Fe²⁺, Fe³⁺; (c) Ca, Ti⁴⁺, Sc³⁺; (d) Be²⁺, Na⁺, Ne.