Potassium?
If the atomic number of Potassium is 19, how many protons and neutrons are within the nucleus? Also, if the atom is neutrally charged, how many electrons would be in it? The atomic mass is 39.0983.... does this have anything to do with the amount of neutrons? Please explain how to do this , I do not understand one bit.
Answer:
The atomic number is the same as the number of protons (that is the definition of atomic number). Since protons are positive and electrons are negative if the atom is overall neutral it will have the same number of protons and electrons. The mass does indeed have to do with the number of neutrons- the mass is protons and neutrons together. However the mass you're telling me is the AVERAGE atomic mass, and is not as exact number because it includes averaged all the different numbers of neutrons the atom could naturally have.
Your teacher probably wants you to say what the number most often is if that is all the info you're given- so round it to 39amu and know that is equal to the protons and neutrons together.
ATOMIC MASS - ATOMIC NUMBER = NEUTRONS
39.1 - 19 = 20.1
20.1 = number of neutrons
atomic number = number of protons = number of electrons = 19
The number of protons is equal to the atomic number of the element (Potassium is 19). The number of electons is equal to the number of protons, so there are 19 electrons. For the number of neutrons, you subtract the atomic number from the atomic mass to find 20 neutrons.
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Answer:
The atomic number is the same as the number of protons (that is the definition of atomic number). Since protons are positive and electrons are negative if the atom is overall neutral it will have the same number of protons and electrons. The mass does indeed have to do with the number of neutrons- the mass is protons and neutrons together. However the mass you're telling me is the AVERAGE atomic mass, and is not as exact number because it includes averaged all the different numbers of neutrons the atom could naturally have.
Your teacher probably wants you to say what the number most often is if that is all the info you're given- so round it to 39amu and know that is equal to the protons and neutrons together.
ATOMIC MASS - ATOMIC NUMBER = NEUTRONS
39.1 - 19 = 20.1
20.1 = number of neutrons
atomic number = number of protons = number of electrons = 19
The number of protons is equal to the atomic number of the element (Potassium is 19). The number of electons is equal to the number of protons, so there are 19 electrons. For the number of neutrons, you subtract the atomic number from the atomic mass to find 20 neutrons.
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