The atomic weight of an atom, or the molecular weight of a molecule, is its mass relative to that of a(n) ________ atom. This is essentially equal to the number of protons plus neutrons that the atom or molecule contains.
举一反三
- 下列（）为聚合物。 A: monomer B: polymer C: molecule D: atom
- A(n) ____________ is a substance that cannot be separated into simpler substances by chemical means. A: mixtures B: elements C: atom D: molecule
- Enzymes make use of nonprotein molecules: they frequently have a small molecule or metal atom associated with their active site that assists with their catalytic function.
- Which is the most abundant atom (% body weight) in the human body? ( ) A: Hydrogen B: Oxygen C: Carbon D: Nitrogen
- All atoms of a given element have the same __________. A: mass B: number of protons C: number of neutrons D: number of electrons and neutrons E: density