Periodic Trends in the Properties of Elements

Which of the following has smallest radius ?

Calculate Allred-Rochow's electronegativity of fluorine.(Covalent radius of fluorine is $0.72 {\mathrm{A}}^{\circ }$)

Correct expression of Allred and Rochows scale is :

Calculate the electronegativity of silicon using Allred Rochow method. Covalent radius of silicon is $1.175 {\mathrm{A}}^{\circ }$.

Covalent radius of fluorine is $0.72 {\mathrm{A}}^{\circ }$, Calculate its Allred-Rochow's electronegativity to nearest integer.

Why is the electron gain enthalpy of oxygen or fluorine are less than that of sulphur or chlorine?

Electron gain enthalpy of oxygen and fluorine are less negative than the corresponding elements of the third period.

The electron gain enthalpy of fluorine is less negative than that of chlorine. why?

Assertion. ${\mathrm{Na}}^{+}$ and ${\mathrm{Al}}^{3+}$ are isoelectronic but the magnitude of the ionic radius of ${\mathrm{Al}}^{3+}$ is less than that of ${\mathrm{Na}}^{+}$ .

Reason. The magnitude of effective nuclear charge of the outer shell electrons in ${\mathrm{Al}}^{3+}$ is greater than in ${\mathrm{Na}}^{+}$ .

Density of elements across a period :

How atomic density changes from left to right in the periodic table.

How atomic density changes from top to bottom in the periodic table.

Write the hydrated size of cations of alkaline earth metals?

Describe the effect of hydration energy in the solubility of salts in water?

Describe use of lattice energy in the solubility of salts in water?

What is the relationship between Thermal stability of salts and lattice energy?

Explain the acid strength of oxoacids of chlorine?

How the acidic strength of hydrides along the period?

How the acidic strength of hydrides down the group?