They are found in all three states of existence. Here are some other physical properties of halogens that make them a very unique family of elements. Appearance Appearance wise fluorine exists as a pale yellow gas that is poisonous in nature, while chlorine is similarly poisonous but exists as a pale green colored gas.alogens range from solid (I2) to liquid (Br2) to gaseous (F2 and Cl2) at room temperature. The chemical properties are more uniform. The halogens have very high electronegativities. Fluorine has the highest electronegativity of all elements.
An example of a phenotypic trait is hair color; there are underlying genes that control the hair color, which make up the genotype, but the actual hair color, the part we see, is the phenotype.
Genotype is what is there, though this would be in terms of genes not whole chromosomes. And phenotype is what is expressed. Also the eye color example is a good one though don't forget that this is determined by more than just two alleles of one gene, so it's a little simplistic but still a useful example. Genotype not being the same as Phenotype can get a little sticky once you get into codominance or genetic masking. More simply put, take the example of a heterozygote. The subject would have a dominant allele and a recessive one for a gene.