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Answers
valence electrons:1 hour more electrons in the outer shell of an atom that is responsible for the chemical property of the atom.
valency:-valency is the number of hydrogen atoms that can combine with r replace one of the element.
metal reactivity:-metal reactivity is a group of metal elements that can form a reaction with acids ,water, mineral acids, and powerful oxidising acids
atomic size:-it is the measurement of the size of its atom usually the mean are typing kal distance from centre of the nucleus to the boundary of atom.
metallic character and nonmetallic character:- metallic character refers to the level of reactivity of a metal.
in non metallic character refers to the tendency of accept the electron during chemical reaction.
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Answer:
Valance electrons : The electrons present in the outermost shell of the element
Valency : It is the combining capacity of an element to form noble gas configuration either by gaining or losing electrons.
Atomic size : Atomic size depends on the number of electrons. The more number of electrons means more number of shells. As number of shells increase means the distance (radius) between the Neucleus and the shell of the element increase.
Metallic and Non-metallic character: I m giving only one character of them,
Metals are generally Electropositive and non metals are generally electronegative.
Metal Reactivity : It is the capacity of the metal to react with metals or non metals and compounds.