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Just help just help just help just help look at pic​

Just help just help just help just help look at pic​-example-1
User Scaraux
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Answer:

The combined number of protons and neutrons.

Step-by-step explanation:

The combined number of protons and neutrons is actually the Mass Number of one Isotope of Sodium ( 11 protons + 12 neutrons). It is the most abundant isotope - that is why the value is 22.99 which is more accurately call the Relative Atomic Mass of sodium.

User Enthusiastic
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