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 […]
Tag: chemistry Question and answer
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 […]
Define ionization enthalpy. Explain the trends observed in the ionization enthalpies of the d-block elements.
Definition of ionization enthalpy. Ionization enthalpy is defined as the amount of energy required to remove the outermost electron completely from a gaseous atom in its ground state. Explanation of ionization enthalpies of the d-block elements. i. The ionization enthalpies of […]
Why are Cr, Mo and W hard metals while Zn, Cd and Hg are not very hard metals?
i. The d-orbitals containing unpaired electrons may overlap to form covalent bonds which are responsible for the hardness. ii. As the number of unpaired electrons increases, the number of covalent bonds and the strength of the metallic bonds increases. The […]
Explain the metallic characters of the d-block elements.
i. All the transition elements are metallic in nature. They either have hexagonal close pack (hcp), cubic close pack (ccp) or body centred cubic lattices which is a characteristic of true metal. ii. They are hard, lustrous, malleable and ductile […]
State the general characteristics of transition elements or d-block elements
Characteristics of transition elements: i. Most of the transition elements are metals and thereby they show metallic properties such as ductility, malleability, electrical conductivity, high tensile strength and metallic luster. ii. Except mercury which is liquid at room temperature, other transition […]
Explain the position of d-block elements in the periodic table.
Position of d-block elements in the periodic table: i. The d-block elements lie in between s- and p-block elements, i.e., these elements are located in the middle part of the periodic table. ii. The d-block elements are present in 4th […]