valency ['veɪlənsɪ]

例句:

• Except for the transitional elements, valency electrons are in the outermost electron shell.
  除去过渡元素外, 价电子位于最外面的电子层.
  
• Carbon has a valency of 4.
  碳的化合价是4价。
  
• The antibiotic activity and valency connect with transfer efficiency and dissociation constant.
  抗菌活性和抗生素效力与能量转移效率和解离常数有关.