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How do I find the mass number (amu), atomic number, number of neutrons, number of electrons, and charge of?

  • How do I find the: ---mass number (amu) ---atomic number ---number of neutrons ---number of electrons ---and charge of an element? I know the atomic number of elements but how do I find the rest? I thought the protons/atomic number and the number of electrons were the same number? Can you show me how to find all these? I'm having more trouble on finding the # of neutrons and # of electrons. Thank you

  • Answer:

    You are right. The protons/atomic number and the number of electrons are the same number. To find the mass number, you need to round the atomic weight of the element of interest to the nearest whole number (note, the atomic weight can be found using a periodic table). Once you have the mass number, you can easily determine the number of neutrons of an atom. Mass number = protons + neutrons Therefore, neutrons = mass number - protons The charge of an element = number of protons - number of electrons = 0

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Mass number = protons + neutrons Therefore, neutrons = mass number - protons The charge of an element = number of protons - number of electrons = 0

Ibrahim

You can read all that from periodic table of elements. For instance, oxygen (O) has atomic number 8. This is also the number of electrons and the number of protons. N(e-) = N(p+) = 8. Mass number is usually written above the symbol in periodic table, for oxygen it is 16,00. To find out the number of neutrons; n(n)= mass number - n(p+) = 16,00 - 8 = 8. Therefore, oxygen has 8 protons, 8 electrons and 8 neutrons. Unless you see + or - with a symbol of an element (e.g. H+ or Cl-), it is neutral, meaning it does not have a charge (the number of protons (+) is equal to the number of electrons (-)). H+ has a positice charge, while Cl- has a negative charge.

Jake Tyler

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