Classification of Elements

1 )

The most electronegative element possess the electronic configuration

2 )

The maximum number of electrons in d– orbital of an element with atomic number 46 is

3 )

The ionisation enthalpy of Cs is 375.6KJmol^–1< what is the energy required to convert [at mass of Cs = 133] 2.66mg o f gaseous Cs completely to Cs⁺

4 )

The atomic number of elements M, N, & P are x, x–1, x–3. If P is a halogen atom then the type of bond between N & P is

5 )

The elements X. Y. & Z have 2, 3 & 4 electrons in the outermost orbital respectively. The element which form most basic oxide is