What is the nature of elements which are purified by zone-refining method?

Explanation

**Step-by-Step Solution:**

1. **Understanding Zone Refining Method**: Zone refining is a technique used to purify metals and semiconductors. It involves melting a small region of a solid material and moving this molten zone along the solid, allowing impurities to be segregated and removed.

2. **Nature of Elements**: The elements that are typically purified using the zone refining method are those that require high purity for their applications. This includes:
- **Semiconductors**: Elements like silicon (Si) and germanium (Ge) are commonly purified using this method. These materials are crucial in the electronics industry for making transistors and diodes.
- **High Purity Metals**: Other elements such as boron (B), indium (In), and gallium (Ga) are also purified using zone refining. These metals are used in various high-tech applications, including electronics and optoelectronics.

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