This question has multiple parts. Work all the parts to get the most points Choo

Question

This question has multiple parts. Work all the parts to get the most points Choose the best definition for mass number Mass number is the mass of an atom 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 sum of the number of neutrons and elections for an atom What it the difference between man number and atomic mass? Atomic mass it the matt 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 man of electrons it small relative to that of a proton of neutron the roan number approximates the atomic mass Atomic man it the mats of an atom When the matt it expressed in u the mass of a proton and of a neutron are both relatively small Because the matt of elections it one the mass number approximates the atomic mass Atomic matt it the matt of an atom When the mats it expressed in u the man of a proton and

Explanation / Answer

A)

mass numebr is the addition of protons + neutrons, it is unique for each isotope, since each isotope will have different properties, for instance, mass, half life and reactivity

best asswer is the third option

B)

mass number = total number of protons + neutrons

atomic mass = total mass of atom, i.e. proton + neutrons + electrons, and has atomic mass units

The mass of the electron is 1800 times smaller, so it can be considered 0 when added with protons + neutrons

From th list, the best answer is the FIRST

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