What is electron negativity ? How does it change in a period as well as in a group ?

What is ionization energy ? How does it change in a period as well as in a group ?

Define electron gain enthalpy or electron affinity. How does it vary along the period and down the group ?

How does the property vary in periods and in groups ?

What do you mean by the term electron gain enthalpy? How does electron gain enthalpy change along a period and in a group?

What do you mean by the term electron gain enthalpy? How does electron gain enthalpy change along a period and in a group?

What do you mean by the term electron gain enthalpy? How does electron gain enthalpy change along a period and in a group?

What do you mean by the term electron gain enthalpy? How does electron gain enthalpy change along a period and in a group?