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Name of element – mass # Ex. Potassium – 40 This would be an atom of potassium with a mass number of 40 19 protons (because the atomic # is always 19 for potassium) 21 neutrons (40-19 = 21) Mass #Symbol Ex. 40K Note: Nuclear notation can also include the atomic # below the mass #, but this isn’t essential since the identity of the element allows you to determine the atomic #. Mass #Symbol Atomic #

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Name of element – mass #
Ex. Potassium – 40
This would be an atom of potassium with a mass number of 40
19 protons (because the atomic # is always 19 for potassium)
21 neutrons (40-19 = 21)

Mass #Symbol
Ex. 40K
Note: Nuclear notation can also include the atomic # below the mass #, but this isn’t essential since the identity of the element allows you to determine the atomic #.
Mass #Symbol
Atomic #




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    1. Quizzma Team

      Sure! Let’s break down the example of potassium and apply it to another element for clarity.

      Let’s take Carbon as an example.

      1. Name of Element – Mass #: Carbon – 12

      – This represents an atom of carbon with a mass number of 12.
      – Carbon has an atomic number of 6 (which means it has 6 protons).

      2. Calculating Neutrons:

      – Neutrons = Mass number – Atomic number

      – Neutrons = 12 – 6 = 6

      3. Mass # Symbol:

      – This can be written in nuclear notation as:

      – 12C

      To summarize for Carbon:

      – Mass # Symbol: 12C

      – Atomic #: 6

      This notation means that this carbon atom has a mass number of 12 with 6 protons and 6 neutrons.

      Feel free to ask about another element or if you have further questions!

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