Which of the following is true regarding a typical atom?
|A|| Neutrons and electrons have the same mass|
|B|| The mass of neutrons is much less than that of electrons|
|C|| Neutrons and protons together make the nucleus electrically neutral|
|D|| Protons are more massive than electrons|
Ans. D This question asks for a true statement from the choices. Let's look at each of those choices. Choice A is incorrect, because neutrons and electrons do not have the same mass. Choice B claims that the mass of a neutron is less than that of an electron. That is not true either. Protons are positive and neutrons are neutral. They cannot together make the nucleus neutral. In fact, the nucleus is positively charged, not electrically neutral. So Choice C is wrong. The last choice makes perfect sense. A proton is more massive than an electron.