# What determines the size of an ion in an octahedral complex?

• lord12
In summary, the radius is the distance from the center of a circle or sphere to its outer edge. To measure the radius of a circle, you can use a ruler or measuring tape to measure the distance from the center of the circle to any point on the outer edge. A sphere has a larger radius than a circle because it is a three-dimensional shape with a curved surface, while a circle is a two-dimensional shape with a flat surface. The radius of a circle is half the length of its diameter, and cannot be negative as it is a physical measurement of distance.
lord12
An an octahedral complex with all strong field ligands, which ion has the larger radius, Fe2+ or Co2+? What are the rules for known the size of the ion with respect if its a weak or strong field ligand?

The ion with the larger radius in this case would be Fe2+. The size of an ion is determined by the strength of its ligands, with stronger ligands resulting in a smaller ion and weaker ligands resulting in a larger ion. In this case, all strong field ligands in an octahedral complex would result in a smaller ion, so Fe2+ would have a larger radius compared to Co2+ with the same ligands. This is because strong field ligands cause a greater splitting of the d orbitals, resulting in a higher energy and a more compact ion. In contrast, weak field ligands do not cause as much splitting and therefore result in a larger ion.

## 1. What is the definition of radius?

The radius is the distance from the center of a circle or sphere to its outer edge.

## 2. How do you measure the radius of a circle?

To measure the radius of a circle, you can use a ruler or measuring tape to measure the distance from the center of the circle to any point on the outer edge.

## 3. Which has a larger radius, a circle or a sphere?

A sphere has a larger radius than a circle because it is a three-dimensional shape with a curved surface, while a circle is a two-dimensional shape with a flat surface.

## 4. How does the radius relate to the diameter of a circle?

The radius of a circle is half the length of its diameter. This means that if you know the radius, you can find the diameter by multiplying the radius by 2.

## 5. Can the radius of a circle be negative?

No, the radius of a circle cannot be negative. It is a physical measurement of distance, and distance cannot be negative.

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