Choose the best definition for mass number. Mass number is the mass of all proto
ID: 496544 • Letter: C
Question
Choose the best definition for mass number. Mass number is the mass of all protons in an atom Mass number is the sum of the number of protons and the number of neutrons for an atom Mass number is the mass of an atom Mass number is the sum of the number of protons, neutrons, and electrons for an atom. What is the difference between mass number and atomic mass ? Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both relatively small. Because the mass of electrons is one, the mass number approximates the atomic mass. Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both approximately one. Because the mass of electrons is small relative to that of a proton or neutron, the mass exactly equals the atomic mass. Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both approximately one. Because the mass of electrons is small relative to that of a proton or neutron, the mass number approximates the atomic mass. Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both approximately one. Because the mass of electrons is also one, the mass number approximates the atomic mass.Explanation / Answer
a) mass number is the sum of number of protons and number of neutrons for an atom.
It total number of particles present in nucleus is the mass number. In nucleus there are protons and neutrons. )
b) atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both approximately one. Because mass of electron is small relative that of mass of proton and mass of neutron. The mass number approximately the atomic mass.