Q.58:- Give reasons: (i) IE1 of sodium is lower than that of magnesium whereas IE2 of sodium is higher than that of magnesium. (ii) Noble gases have positive value of…

Q.57:- The first ionisation enthalpy of magnesium is higher than that of sodium. On the other hand, the second ionisation enthalpy of sodium is very much higher than that of magnesium….

Q.56:- (a) How does atomic radius vary in group in the periodic table? (b) Explain (i) Radius of cation is less than that of the atom. (ii) Radius of anion…

Q.55:- Discuss the factors that influence the magnitude of ionization enthalpy. What are the general trends of variation of ionization enthalpy in the periodic table? Explain     Answer:- Factors affecting…

Q.54:- Define electron gain enthalpy. What are its units? Discuss the factors which influence the electron gain enthalpy.   Answer:- Electron gain enthalpy is the energy released when an isolated gaseous…

Q.53:- Discuss the main characteristics of four blocks of elements in the periodic table? Give their general electronic configuration.   Answer:- s-block elements: They are highly reactive elements and thus occurs…

Q.52:- Discuss the main features of long form of the periodic table. What are the advantages of long . form of periodic table?     Answer:- Main features of long form…

Q.51:- Define electron gain enthalpy. What are its units?   Answer:- The energy which is released by an atom in gaining an electron from outside atom or ion to form negative…

Q.50:- What is screening or shielding effect? How does it influence the ionization enthalpy ?     Answer:- In a multielectron atom, the electrons present in the inner shells shield the…

Q.49:- Give the electronic configuration of the transition elements. Write their four important characteristics.     Answer:- The d-block elements are known as transition elements. Electronic configuration =(n – 1) d1-10…