Examine the activity series given below. 
Which of the following elements would be the least likely to release hydrogen gas (H2) upon reaction with water or acid?
Definitions:
Linkage Equilibrium
Linkage equilibrium exists for any two loci if the occurrence of an allele at one of the loci is independent of the presence or absence of an allele at the other locus.
Linkage Disequilibrium
The non-random association of alleles at different loci in a given population, often due to their proximity on a chromosome.
Chromosomes
Structures made of DNA and protein found in the nuclei of cells, carrying genetic information in the form of genes.
Environmental Conditions
The various physical and biological factors that influence an organism's life and development.
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