This Celtic symbol of everlasting love is formed from two triskeles. The triskeles, three cornered knots, denote the three aspects of two people, body, mind and spirit. The two triskeles, joined together, show a circle, the everlasting circle of eternity.
All the others are weak acids. A strong acid is one that dissociates completely when it dissolves in water. Dissociate means that the substance splits apart into ions. There are only a few strong acids in water, they are: HBr, HCl, HI, HNO3, HClO4 and H2SO4 (for the first H only) All other acids are weak acids. Chemists use the term strong or weak with regard to acids and bases to tell how much the substance dissociates in water.
Fluorine, the lightest of the halogens, has several unique features to its chemistry which merit individual discussion: The bond strength of the F2 molecule is unexpectedly low when compared to the other dihalogens. This is due to the repulsion between the lone pairs on the fluorine atoms (non-bonding pair repulsion) which becomes important when they are so close together. In the larger halogens, the atoms are not so close together and this extra repulsion is not so important.