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How many protons, electrons, and neutrons are in an atom?
Step 1 Use your periodic table to find an element
Step 2 The number of Protons (+ charge) The atomic number = # protonsKr has 36 protons
Step 3 The number of Electrons (- charge)Remember atoms have no overall charge. Atoms must have an equal # of protons and electrons #protons=#electrons Kr has 36 electrons
Step 4 Neutrons = Mass # - Protons The number of Neutrons (no charge)Mass # (atomic weight rounded to nearest whole #) Neutrons = Mass # - Protons Neutrons = 84 – 36 Neutrons = 48
Summary Number of Protons = Atomic # Number of Electrons = ProtonsNumber of Neutrons = Mass # - Protons
Problems Find the protons (p+), electrons (e-), neutrons (n) of OxygenFind the p+, e-, n of Xenon (Xe) Find the p+, e-, n of Zirconium (Zr)
Oxygen (O) p+, e-, n Number of Protons = Atomic #Number of Electrons = Protons Number of Neutrons = Mass # - Protons Protons = 8 Electrons = 8 Neutrons = 16-8 = 8
Xenon (Xe) p+, e-, n Number of Protons = Atomic #Number of Electrons = Protons Number of Neutrons = Mass # - Protons Protons = 54 Electrons = 54 Neutrons = = 77
Zirconium (Zr) p+, e-, n Number of Protons = Atomic #Number of Electrons = Protons Number of Neutrons = Mass # - Protons Protons = 40 Electrons = 40 Neutrons = = 51
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