What is the difference between the atomic number and the atomic mass?

Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus. It is the average weight of an element. It is the total number of nucleons in the atom's nucleus.

Explanation:

Hope this helps have a great day its kinda hard to put it in one sentence so uhh just read this and make it into one sentence  

atomic number is equal to no.of protons or no.of electrons and no.of neutros+atomic num=atomic mass

Explanation:

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your answers are a,b,,e and f

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explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.