Discuss the following trends in halogens.
(a) atomic radius
(b) ionisation potential
 (c) electron affinity and
(d) electronegativity. 

With reference to the alkali metals in Group 1 [IA] & the halogens in 17 [VIIA] explain the trend in ionisation potential, electron affinity and electronegativity on moving down the groups in the periodic table.

Discuss the trend in the following properties of noble gases: (i) Melting and boiling point. (ii) Ionization enthalpy. (iii) Electron affinity. (Electron gain enthalpy)

On Mulliken scale, the average of ionisation potential and electron affinity is known as ________.

Explain the trends in property in halogen family as given under: (i) Ionization enthalpy (ii) Oxidation state (iii) Electron affinity or electron gain enthalpy.

Describe the general trends in the following properties of the elements in groups 13 and 14 (a) Atomic size (b) Ionisation enthalpy (c) Metallic character (d) Oxidation states (e) Nature of halides.

The first ionisation potential in electron volts of nitrogen and oxygen atoms are respectively given by

Which of the following does not affect the ionisation potential of the atom ?

Which of the following is affected by the stable electron configuration of an atom? (a) Electronegativity (b) ionisation enthalpy (c ) Electron gain enthalpy Correct answer is:

Name the elements of group 17. Describe the trend in the properties of halogens such as: (a) Bond energy (b) Ionization enthalpy (c) Oxidising power (d) Reactivity and (e) Reducing power of halogen halides.

N_(0)//2 atoms of X(g) are converted into X^(+) (g) by energy E_(1) . N_(0)//2 atoms of X(g) are converted into X^(-) (g) by the energy E_(2) . Hence ionisation potential and electron affinity of X(g) are :