s-Block ElementsHard
Question
Which of the following increases in magnitude as the atomic number of alkali metals increases?
Options
A.Electronegativity
B.First ionisation potential
C.Ionic radius
D.Melting point
Solution
(A) Down the group, the atomic size increases with increasing atomic number and so attraction for shared pair of electrons decreases. Hence electronegativity decreases.
(B) Down the group, the atomic size increases with increasing atomic number and so attraction between valence electron and nuclear decreases. Hence ionization energy decreases.
(C) Down the group atomic size increases with increase in number of atomic shells while effective nuclear charge remains constant.
(D) Down the group atomic size increases with increase in number of atomic shells and therefore, the strength of metallic bond decreases. So melting point decreases.
(B) Down the group, the atomic size increases with increasing atomic number and so attraction between valence electron and nuclear decreases. Hence ionization energy decreases.
(C) Down the group atomic size increases with increase in number of atomic shells while effective nuclear charge remains constant.
(D) Down the group atomic size increases with increase in number of atomic shells and therefore, the strength of metallic bond decreases. So melting point decreases.
Create a free account to view solution
View Solution FreeMore s-Block Elements Questions
CaCl2 + H2SO4 CaSO4.2H2O (r) (s) Which of the following option describes, the products, reactants and the reaction condi...A colourless solid (X) on heating evolved CO2 and also gave a white residue, soluble in water. Residue also gave CO2 whe...The molecular formula of plaster of pairs is :...Which is not s-block element ?...Sodium metal can be stored under :...