An atom with 11 electrons, 11 protons and 12 neutrons is electrically neutral. Why?
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If it is a sodium atom, then Z = 11 by definition. If there are 11 protons, THERE MUST be 11 electrons orbiting around the atom, because the element here is NEUTRAL. If it is a 23Na nuclide, there must be 12 neutrons in the nucleus
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Sodium has an atomic number of 11. The number of protons determines the atomic number. The 11 protons makes an atomic number of 11.
The 11 protons have a charge of +11 while the 10 electrons have a charge of -10. This results in a net charge of +1
+11+−10=+1
Sodium
23
11Na
is the most common isotope of sodium.
The mass of an atom is the sum of the number of protons and neutrons. 11 protons and 12 neutrons results in a total mass of 23
11+12=23
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