Answer: Solids are classified as crystalline and amorphous on the basis of the presence or absence of orderly arrangement of their constituent particles (atoms, ions or molecules). i. Crystalline solids: A crystalline solid is a homogeneous solid in which the […]
Tag: chemistry note
Give characteristics of solid state.
The solid state is characterized by the following properties: i. Solids have definite mass, volume, shape and density. Usually, the density of solid state is greater than the density of liquid and gaseous state. Water and mercury are exceptions. The […]
Define a solid. Under what conditions does a substance exist in solid state?
Answer: Matter can exist in three states namely, solid, liquid and gas. Under a given set of conditions of temperature and pressure, the most stable state of a substance depends upon the […]
Briefly explain why electronic configurations of lanthanoids are not known with certainty.
In the lanthanoids, 4f and 5d subshells are very close in energy. The outermost 6s-orbital remains filled with two electrons (6s2) . The electrons can easily jump from 4f to 5d or vice-versa. Further, irregularities in electronic configurations are also […]
Explain the meaning of inner transition series.
i. The last electron in the f-block elements enters into (n-2) f-orbitals, i.e., inner to the penultimate energy level and they form a transition series within the transition series (d-block elements). Hence, the f-block elements are known as inner transition […]
What are f-block elements?
i. The elements in which the last electron enters into (n–2) f-orbital of the atoms are called f-block elements. ii. In these elements, the last electron enters in to the prepenultimate (n–2) shell (called antepenultimate). iii. The general valence electronic […]
State the characteristics of interstitial compounds.
Characteristics of interstitial compounds: i. The chemical properties of interstitial compounds are similar to those of the parent transition metal. ii. They are hard and lustrous. iii. They exhibit electrical and thermal conductivity. iv. They have melting points higher than […]