Question

atomic number the smallest unit of an element that maintains the chemical properties of that element
isotope an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
mass number the sum of the numbers of protons and neutrons in the nucleus of an atom
mole the si base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon - 12
neutron a subatomic particle that has no charge and that is located in the nucleus of an atom
proton a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons in the nucleus is the atomic number, which determines the identity of an element
unified atomic mass unit a unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 of the mass of a carbon atom with mass number 12

1. compare what is the difference between mass number and atomic mass?

Explanation:

La masa atómica es una medida de la masa de un átomo o molécula, definida como exactamente \(1/12\) de la masa de un átomo de carbono con número de masa 12. En cambio, el número de masa es la suma de los números de protones y neutrones en el núcleo de un átomo.

Answer:

La masa atómica es una unidad de masa que describe la masa de un átomo o molécula (exactamente \(1/12\) de la masa de un átomo de carbono con número de masa 12), mientras que el número de masa es la suma de los números de protones y neutrones en el núcleo de un átomo.