Question

explain electron afinity,electronegativity electron positivitity and metal and non metal How there properties vary in a group and period​

Answer 1

Answer:

The electron affinity is the potential energy change of the atom when an electron is added to a neutral gaseous atom to form a negative ion. So the more negative the electron affinity the more favourable the electron addition process is. Not all elements form stable negative ions in which case the electron affinity is zero or even positive.

Electronegativity is the tendency of an atom to attract, in its combined state, a shared pair of bonded electrons. Non-metals are generally known to have high electronegativities (in comparison with metallic elements). Electropositivity is the tendency of an atom to donate electrons and withdraw form covalent bonds to form positively charged cations. Metallic elements are usually known to exhibit electropositivity.

Metals and Nonmetals are different types of materials present around us. ... Metals (like copper and aluminium) are good conductors of heat and electricity, while nonmetals (such as phosphorus and sulfur) are insulators.The tendency to gain electrons increases on moving across a period due to an increase in the nuclear charge and decrease in the atomic size. Hence, the non-metallic character increases across a period. As we move down the group, the non-metallic character decreases due to increase in the atomic size.

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