A: electrons
B: protons
C: photons
D: Neutrons
举一反三
- Rutherford proposed ( ) by analyzing the results of the α particle scattering experiment A: Atomic nuclear structure model B: There are neutrons in the nucleus C: Electrons are part of atoms D: The nucleus is made up of protons and neutrons
- 以下属于直接电离辐射的是（） A: X-rays B: γ-rays C: β-rays D: neutrons
- 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
- X-rays and gamma rays can be used to detect and treat cancer ______.
- The idea that electricity cannot be created or destroyed may seem to imply that electrons and protons cannot be created or destroyed.
内容
- 0
Nuclides<br/>with the same number of protons but different numbers of neutrons, we<br/>called them:() A: Isotope B: Isomer C: Stable nuclide D: Unstable nuclide
- 1
X-rays are also called Rontgen rays _____ the discoverer who first put them to use. A: in case of B: in view of C: in place of D: in honor of
- 2
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.
- 3
Our football team ______ twelve members. A: is made of B: is made up for C: is made from D: is made up of
- 4
The backbone of a DNA molecule is: ( ) A: made up of sugars B: made up of nitrogenous bases C: made up of phosphate groups D: made up of alternating phosphate and sugar groups E: made up of alternating sugars and nitrogenous base