Lv 6
Glo asked in Science & MathematicsChemistry · 9 years ago

chemistry help about protons, neutrons, electrons?

You might not believe this, but I am in AP Chemistry. This is a very elementary questions but I just get these mixed up a little!

Are these amounts right?

protons = atomic number

protons = electrons

neutrons = ???

Any help is appreciated.

What I basically want to know is, how do you find the number of/what is the relation between protons, neutrons, electrons, and an atoms atomic number?

3 Answers

  • Anonymous
    9 years ago
    Best Answer

    Atomic number is number of protons and electrons. Not together like as in 28 it has both 28 protons and 28 electrons.

    And you can calculate neutrons by taking the atomic mass and rounding it and then subtracting it with the atomic number.

    If atomic number = 5

    and atomic mass is like 5.67 I would round it to 6

    and go 6-5 and get 1

    1 is number of neutrons :D

  • Albert
    Lv 4
    9 years ago

    Protons = Atomic number. So far so good.

    Protons = Electrons Usually. This is NOT the case with ions.

    Mass Number - Protons = Neutrons. Mass number is usually given on a periodic table or in a question.

    This is important when looking at isotopes. Isotopes are the same elements (same number of protons) that have different number of neutrons.

  • anon
    Lv 6
    9 years ago

    Neutrons = mass number - protons ( or atomic number)

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