MCQ
The magnetic quantum is a number related to:
- Asize
- Bshape
- ✓orientation
- Dspin
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Assertion $(A)$: Among group $13$ elements, boron's melting point is unusually high $(2453 \mathrm{~K})$.
Reason $(R):$ Solid boron has a strong crystalline lattice.
In the context of the above statements, choose the correct answer from the following options: