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This is how sodium appears in the periodic table.
An orange box has N a at the center and 11 above. Below it says sodium and below that 22.99. A blue arrow points to 22.99.
The arrow is pointing to sodium’s
number of neutrons.
chemical symbol
atomic mass
combined number of electrons and protons.
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Atomic mass.
22.99 is the (average) atomic mass of sodium in atomic mass units (approximately 23, from which you can infer about 12 neutrons for the most common isotope, since atomic number 11 gives 11 protons).
22.99 is the (average) atomic mass of sodium in atomic mass units (approximately 23, from which you can infer about 12 neutrons for the most common isotope, since atomic number 11 gives 11 protons).
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