Question

The correct order for the size of I,I+,I- is A.I>I->I+ B.I>I+>I- C.I-->I>I+ D.I+>I->I

Answer 1

ANSWER:

OPTION C IS CORRECT

Answer 2

The correct order for the size is C) I-, I, I+.

• As we know the size of an atom or ion decreases across the period and increases down the group.
• The decrease in atomic size across the period is due to increases in effective nuclear charge.
• For the isoelectronic group, size decreases with an increase in positive charge. for example, Mg2+, neon and Na+ are isoelectronic species.
• Atomic size is determined by the charge: proton ratio. The higher the ratio larger the size.
• The size of the anion is larger and the cation is smaller than its parent atom.
• I- is larger because adding an electron to the parent atom causes interelectronic repulsion whereas removal of the electron contracts the size of the parent atom.
• So, the correct order of size is I-, I, I+.