Ar(Al)= - 27, Ar(Na)= - 23, Ar(Cu)= - 64, Ar(Ag)= - 108, Ar(Fe)= - 56, Ar(Zn)= - 65, Ar(Ca)= - 40, Ar(K)= - 39, Ar(C)= - 12, Ar(P)= - 31,

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