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OpenStudy (anonymous):
How many protons are in calcium?
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OpenStudy (anonymous):
Protons - 20 Neutrons - 20 Electrons - 2 are in calcium
OpenStudy (anonymous):
what about potassium, and cesium?
OpenStudy (anonymous):
Atomic number = number of protons = number of electrons = 55 Atomic mass = # of protons + # of neutrons = 132 so the number of neutrons = 132 - # protons = 132 - 55 = 77 Cesium 135 has 55 protons & 55 electrons, plus 80 neutrons.
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