As a group, halogens exhibit highly variable physical properties. Halogens 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.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.
A gene can exist in many different forms, calledalleles. For example, letâs say that there is one gene which determines the color of your hair. That one gene may have many forms, or alleles: black hair, brown hair, auburn hair, red hair, blond hair, etc. You inherit one allele for each gene from your mother and one from your father. Each of the two alleles you inherit for a gene each may be strong (dominant) or weak (recessive).
Caution: If your hair is gray or white, temporary hair color is not temporary: It will leave a permanent stain on your hair. Semi-Permanent Hair Color: Semi-permanent hair color is made for darkening or adding depth to the hair, not for lightening. It coats the hair much like a rinse, but some types do contain small amounts of peroxide (not enough to lighten the hair). You'll often find an activator inside a home semi-permanent color box, which makes your color darker. This is a good option for adding richness to your existing hair color and will last about four to eight weeks. Be careful applying this color all over.