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4.3: HOW ATOMS DIFFER ATOMIC NUMBER

4.3: HOW ATOMS DIFFER ATOMIC NUMBER. Atomic number = number of protons = number of electrons Atomic number defines what the element is Periodic Table is arranged by atomic number. MASS NUMBER. Mass Number = atomic number + number of neutrons

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4.3: HOW ATOMS DIFFER ATOMIC NUMBER

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  1. 4.3: HOW ATOMS DIFFERATOMIC NUMBER Atomic number = number of protons = number of electrons • Atomic number defines what the element is • Periodic Table is arranged by atomic number

  2. MASS NUMBER Mass Number = atomic number + number of neutrons • Mass number is the sum of the protons and neutrons in the nucleus

  3. ISOTOPES • Isotopes - atoms of the same element - same number of protons But different numbers of neutrons (so different mass numbers)

  4. CALCULATING ATOMIC MASS • Atomic mass is the weighted average mass of the isotopes of an element • This is the mass that is given on the periodic table • Formula for average atomic mass: (mass of isotope 1 x % abundance) + (mass of isotope 2 x % abundance) + … Remember x% = 0.0x

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