What r isomers and define isomerism​

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In chemistry, isomers are molecules or polyatomic ions with identical molecular formulas — that is, the same number of atoms of each element — but distinct arrangements of atoms in space. Isomerism is the existence or possibility of isomers. Isomers do not necessarily share similar chemical or physical properties.

Mr. Goog.le says

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole