subatomic particles & Atomic number terms

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Last updated 2:39 AM on 9/6/26
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7 Terms

1
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proton

  • + charge

  • located in the nucleus

  • 1 atomic mass unit


2
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neutron

  • 0 charge

  • located in nucleus

  • 1 atomic mass unit


3
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electron

  • - charge

  • located outside nucleus/electron cloud

  • very small compared to proton/neutron


4
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atomic number

number of protons in an atom

5
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mass number

number of protons + neutrons

6
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isotope

forms of the same element with:

  • same number of protons

  • different number of neutrons

  • therefore different mass numbers


7
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atomic mass

average mass of the naturally occurring isotopes

(measured using the Dalton-Da-)