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Ions 2 - of Boron has 5 neutrons and weighs 10.01 amu –...

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Ions Negative charge: More electrons present: Cl- has 18 electrons (still 17 protons) Cl2- has 19 electrons (still 17 protons) Positive charge: Fewer electrons present: Cl+ has 16 electrons (still 17 protons) Cl2+ has ?
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2.4 Isotopes Carbon atoms often have 6 neutrons but can have 7 or 8 neutrons These are isotopes Mass number = protons + neutrons roughly Mass number is a weighted average of the isotopes
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2.4 Isotopes What’s the atomic mass of Boron? 20.0%
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Unformatted text preview: of Boron has 5 neutrons and weighs 10.01 amu – 80.0% of Boron has 6 neutrons and weighs 11.01 amu 0.200 * 10.01amu + 0.800 * 11.01 amu = 10.81 amu • What’s the atomic mass of a sample that is? 58.3% weighs 28.05 amu 37.1% weighs 29.11 amu The rest weighs 30.15 amu Review • Ions = different number of electrons • Isotopes = different number of neutrons • Atomic number = # protons • Mass number = # protons + # neutrons...
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Ions 2 - of Boron has 5 neutrons and weighs 10.01 amu –...

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