Chemistry Chapter 2

element
- homoatomic molecules
- cannot be broken down further
compound
- heteroatomic molecules
- 2 or more elements form a different substance
chemical formula
- molecular compound
- element symbol + subscript for # of atoms
proton
- subatomic particle
- + charge
- mass = 1 amu
- inside nucleus
neutron
- subatomic particle
- no charge
- mass = 1 amu
- inside nucleus
electron
- subatomic particle
- - charge
- mass = 1/1836 amu
- outside nucleus
atomic number (Z)

number of protons in the nucleus
mass number (A)

number of protons + neutrons
isotope

atoms of an element with same number of protons but different number of neutrons
atomic mass unit
- expresses relative mass of an atom
- 1 amu = 1/12 mass of carbon-12 atom
atomic weight

relative mass of an average atom on an element expressed in amu
molecular weight
- relative mass of a molecule in amu
- sum of atomic weight of all atoms in a molecule

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Chemistry Chapter 2

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Atoms and Molecules

Updated

2010-06-18T17:14:28Z

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