How do you find out how many protons and neutrons are in a compound?
Answer:
find the formula for the compound in question , CO2 , for example...
grab your handy dandy periodic table ... and .tadaaaa !
place your traytable,
in an upright locked position.
in case of an element if u r given its atomic number that will b equal to d no.of protons & d mass number minus atomic number gives u d no.of neutrons
look up the atomic weight. that's the amount of protons + the average amount of neutrons.
then subtract the atomic number. the atomic number is the amount of protons in an atom of the element and is what makes that element that element. add or subtract a proton and it's something else entirely.
the resulting number is an average amount of neutrons in an atom of that substance.
it can have more or less neutrons (resulting in an isotope) but that number (rounded up or down) is the usual amount of neutrons.
Protons are always going to be the same as the atomic number. For example the atomic number for sodium, Na, is 11 (look on periodic table to help show you what I'm talking about). That means there are also 11 protons and 11 electrons. The mass number for Na is 23 (rounded or 22.99 exact). You would subtract the atomic number from the mass number and get the number of neutrons. i.e: 23 - 11 = 12 neutrons.
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