Question

A student incorrectly reported the atomic radii of Fe, Fe+2 and Fe+3 as 118 pm, 65pm and 77pm respectively. Write the correct order of the radii.

Answer 1

Explanation:

C = C

H₅C₂ CH₃ CH₃ C₂H₅ is answer

Answer 2

The correct order of radii is ${Fe}^{ + 3} < {Fe}^{ + 2} < Fe$

Fe is an element with atomic number 26.

It has 26 electrons and 26 protons.

Fe atom with 26 electrons and protons is neutral. When it loses electrons, It forms Cation.

When a metal atom loses electrons, There is a net positive charge on the atom, and due to this nuclear charge increases. When the nuclear charge increases, the size of the atom decreases.

So We can predict the order of atomic radii will follow the order

${Fe}^{ + 3} < {Fe}^{ + 2} < Fe$

Given values of atomic radii as reported by the student are 118, 65, 77 pm.

So We may conclude,

Atomic radii of the species as

$Fe \: \: \: - 118 \: pm \\ Fe^{ + 2} - 77 \: pm \\ Fe^{ + 3} - 65\: pm$