Chem-Chap 2
Chemistry Chapter 2 Vocabulary
Terms
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- compound formula
- symbol for the molecule of a compound, consisting of the symbols of the atoms found in the molecule. atoms present in numbers greater than 1 have the number indicated by subscript
- elemental symbol
- symbol assigned to an element based on the name of the element, consisting of one capital letter or a capital letter followed by a lower case letter
- nucleus
- central core of atoms that contains protons, neutrons and m ost of the mass of atoms
- atomic mass unit (u)
- unit used to express the relative masses of atoms. one u is equal to 1/12 the mass of an atom of carbon -12
- mass number of an atom
- number equal to the sum of the number of protons and neutrons in the nucleus of an atom (symbolically represented by A)
- isotopes
- atoms that have the same atomic number but different mass numbers (of the same element that have a different number of neutrons)
- atomic weight
- mass of an average atom of an element expressed in atomic mass units
- atomic number of an atom
- number equal to the number of protons in the nucleus of an atom (symbolically represented by Z)
- mole
- number of particles (atoms or molecules) contained in a sample of element or compound with a mass in grams equal to the atomic or molecular weight. 1 mol = 6.022 x 10^23 particles
- molecular weight
- relative mass of a molecule expressed in atomic mass units and calculated by adding together the atomic weights of the atoms in the molecule