GENERAL KNOWLEDGE

Detailed explanation-1: -The reactivity of a metal depends on how easily its atoms lose valence electrons. The reactivity of metals decreases from left to right across the periodic table. Alkali metals are highly reactive.

Detailed explanation-2: -The chemical reactivity of an atom is mainly determined by valence electrons. Atoms which have a complete shell of valence electrons tend to be chemically inert. Atoms with one or two valence electrons are highly reactive.

Detailed explanation-3: -The number of valence electrons in atoms may cause them to be unreactive or highly reactive. For those atoms that are reactive, the number of valence electrons also determines whether they tend to give up or gain electrons in chemical reactions. Metals, which easily give up electrons, can conduct electricity.

Detailed explanation-4: -Metals have a less likely chance to gain electrons because it is easier to lose their valance electrons and form cations. It is easier to lose their valence electrons because metals’ nuclei do not have a strong pull on their valence electrons. Thus, metals are known to have lower electron affinities.

Detailed explanation-5: -Four major factors affect reactivity of metals: nuclear charge, atomic radius, shielding effect and sublevel arrangement (of electrons). Metal reactivity relates to ability to lose electrons (oxidize), form basic hydroxides, form ionic compounds with non-metals.