Solid $CO_2$ is an example of

Which crystal system exhibits the highest degree of asymmetry?

Select the correct statements.
$(A)$ Crystalline solids have long range order.
$(B)$ Crystalline solids are isotropic.
$(C)$ Amorphous solids are sometimes called pseudo solids.
$(D)$ Amorphous solids soften over a range of temperature.
$(E)$ Amorphous solids have a definite heat of fusion.
Choose the most appropriate answer from the options given below:

Explain the characteristics of ionic solids.

Which of the following dopants is added to silicon to obtain an $n$-type semiconductor?

Amorphous solids are......