Mass Number / Atomic Number
Mass Number / Atomic Number
· 2 Numbers written next to the symbol - called the mass number & atomic number
· Mass number tell us the number of protons added to the number of neutrons in the nucleus of one atom.
· Atomic number also known as the proton number, which tells us the proton number so, this tells us the number of protons in the nucleus. Neutral atom also tells us the number of electrons.
Example:
Sodium has a mass number of 23 and an atomic number of 11, this means:
· 11 protons (atomic number which is the bottom one normally)
· 11 electrons (atomic number which is the bottom one normally)
· 12 neutrons (mass number - atomic number)
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