Vocab Bloom Hub

mass number

/ˈmæs ˌnʌmbər/

翻译: 原子核中质子和中子的总数,用于标识化学元素的同位素。

1 个条目

phrase

/ˈmæs ˌnʌmbər/C1formalscientific
  • zh原子核中质子和中子的总数,用于标识化学元素的同位素。

The total number of protons and neutrons in the nucleus of an atom, used to identify isotopes of a chemical element.

  1. B2formal

    The total number of protons and neutrons in the nucleus of an atom.

    zh质量数

    • The mass number of carbon-12 is 12.
    • Isotopes of an element have the same atomic number but different mass numbers.
    • The mass number is written as a superscript before the element symbol.