Define Electronegativity. How does it vary along a group?

How does electronegativity of Halogens vary down the group?

(a) How does hot concentrated sodium hydroxide reacts with chlorine ? Write equation . (b) How does electronegativity of Halogens vary down the group ?

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

"Electronegativity is the case of gaining electrons". (a) Which type of elements will have high electronegativity ? (b) How does electronegativity change as we move (i) across a period (ii) down a group ?

i] Atomic radius of hydrogen is 37 pm. Express it in metres. ii] How does atomic size vary in a group and in a period.

What do you mean by Electron affinity ? How it varies in group and periods in modern periodic table?

What do you mean by ionization enthalpy? How does it vary across a period and down a group?

How does electronegativity vary (i) down the group (ii) across the period from left to right ?

How does the valency vary in going down a group?

What is ionisation energy? How does ionisation energy vary along the period in the modern periodic table ?