化合价是元素的一种性质。当不同元素原子之间以离子键形式相互结合时,离子携带的电荷数值,决定了阴阳离子之间结合时需要彼此的数目;以共价键相互化合时,成键原子在形成共用电子对时所能提供的电子数目,决定了原子之间结合时需要彼此的数目。元素的这种性质,称之为化合价。元素 Valence is a property of the element. When atoms of different elements combine with each other in the form of ionic bond, the value of the charge carried by the ions determines the number of each other required for bonding between the anion and the cation. When the covalent bonds are combined with each other, the bonding atoms form a common electron pair The number of electrons that can be supplied determines the number of each other that atoms need to bind to each other. This element of the nature, called the valence. element