The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
The isoelectronic set of ions is :
The correct order of the first ionization enthalpies is :
The element having greatest difference between its first and second ionization energies, is :
The size of the iso-electronic species and is affected by :
azimuthal quantum number of valence shell
electron-electron interaction in the outer orbitals
Principal quantum number of valence shell
In comparison to boron, beryllium has:
lesser nuclear charge and lesser first ionisation enthalpy
greater nuclear charge and lesser first ionisation enthalpy
greater nuclear charge and greater first ionisation enthalpy
lesser nuclear charge and greater first ionisation enthalpy
The pair that has similar atomic radii is:
Mn and Re
Ti and Hf
Sc and Ni
Mo and W
The correct option with respect to the Pauling electronegativity values of the elements is :
Ga < Ge
P > S
Si < Al
Te > Se
The element that shows greater ability to form multiple bonds, is :
The electronegativity of aluminium is similar to :
When the first electron gain enthalpy of oxygen is -141kJ/mol , its second electron gain enthalpy is :
A more negative value than the first .
Almost the same as that of the first .
Negative , but less negative than the first .
A positive value .
In general ,the properties that decrease and increase down a group in the periodic table ,respectively are :
atomic radius and electronegativity
electron gain enthalpy and electronegativity
electronegativity and atomic radius
electronegativity and electron gain enthalpy
The increasing order of the ionic radii of the given isoelectronic species is :
Which of the following represents the correct order of increasing first ionization enthalpy for Ca,Ba,S ,Se and Ar?
Ca < Ba < S < Se < Ar
Ca < S < Ba < Se < Ar
S < Se < Ca < Ba < Ar
Ba < Ca < Se < S < Ar